[Android General] Jupit3r:
The good:

Elegant design and great build quality

Gorgeous display

Superb front-facing cameras

Hi-Fi sound

The bad:

Expensive

The rear-facing camera lacks OIS

The Snapdragon 625 processor isn’t future-proof

No NFC

While other smartphones are battling it out on the benchmark front, vivo, a Chinese smartphone brand which ranks at No.5 in the world in terms of shipment, takes a very different approach in marketing their products. The vivo X9 is one of the newest additions to their “camera & Music” smartphone line. Rocking dual front-facing cameras, the X9 is anticipated to attract consumers with ultimate enthusiasm for selfies.

Key features of the vivo X9

•	5.5″ Super AMOLED of 1920*1080px resolution

•	20MP & 8MP dual front-facing cameras with moonlight LED, F2.0 aperture

•	16MP autofocus camera with LED flash, F2.0 aperture

•	4K video recording (both front and rear cameras)

•	Qualcomm Snapdragon 625 (octa-core 2.0 GHz Cortex-A53, Adreno 506 GPU)

•	4GB of RAM, 64GB internal storage

•	Funtouch 0S 3.0 (on top of Android OS v6.01)

•	AK4376 DAC

•	Dual SIM, dual standby

•	2G Network: GSM 850 / 900 / 1800 / 1900

•	3G Network: HSDPA

•	4G Network: LTE, TD-LTE

•	Wi-Fi 802.11, Wi-Fi Direct, dual-band, Wi-Fi hotspot

•	Bluetooth v4.1

•	USB host (dongle required)

•	Standard 3.5 mm audio jack

•	3,050mAh irremovable Li-Po battery

Retail package and Accessories

The vivo X9 comes with very elegant packaging and lots of accessories. Inside the box you will find a phone, a charger, a cable for charging and data transmission, two protective cases and two screen protectors.

Design and build

At a glance, the X9 looks like just another extremely refined smartphone from vivo: a large display is dominating the front, and there is relatively small bezel around.

The only major difference you will instantly notice is that there are dual front-facing cameras now, both located on the left side of the ear piece. On the right side, you will find a light sensor and a moonlight LED flash.

There are some less obvious differences which makes the X9 more aesthetically pleasing than its predecessors: the width of the bezel on the left and right side is only 1.59mm each, compared to the 1.82mm of the vivo X7. The black frame around the display has also been reduced. The corners are more rounded, as well.

There is an oval Home button below the display, with a built-in fingerprint reader embedded in it. This key is both capacitive and physical, and offers decent key travel when pressing on it. The oval home button on my Samsung S7 Edge often failed to read my fingerprints due to its narrow reading area, fortunately I haven’t experienced the same problem with the vivo X9, thanks to the relatively larger reading area.

The bottom side plays host to a Micro USB port, stereo speaker gates and a 3.5mm headphone jack. It is quite disappointing that vivo decided to choose a Micro USB port instead of a more advanced USB Type-C port for its latest phone. As the latter becomes increasingly popular, it is for certain that Micro USB will be abandoned in the near future.

The power button and volume rocker are hosted on the right side, both of them are very easy to locate and offer tactile feedback to the users.

On the left side is a SIM Tray slot, you can use the stock tool to take the SIM tray out.

As you can tell from the picture above, the X9 supports using dual nano-SIM card in one phone.

The uniqueness in the X9’s design is more pronounced on its rear side. The plastic strips which allow signals to travel through are now located more towards the top side and bottom side, giving the back of the phone a more unified look. The rear-facing camera does pop up a little, but as the lens is covered by sapphire glass, it won’t get scratches easily. If you are still concerned, the cases which can be found in the retail package will save you from those worries.

The vivo X9 measures 152.6*74*6.99mm, about the same dimensions as the Samsung S7 Edge (150.9*72.6*7.7mm) and One Plus 3 (152.7x74.7x7.35mm), more compact than the Apple iPhone 7 Plus (158.2*77.9*7.3mm). Using the phone with one hand shouldn’t be a problem for most people, and for folks with smaller hands, there's a one-handed mode that resizes things onscreen to make apps easier to reach. The X9 weighs 154g, also about the same as the Samsung S7 Edge (157g) and One Plus 3 (158g), significantly lighter than the Apple iPhone 7 Plus (188g). Thanks to the balanced weight distribution, the X9 feels even lighter than the number suggests.

The build quality of the X9 is amazing. The front side of the phone is covered by Corning Gorilla glass 5, which is super resistant to scratches, and may be able to survive many occasional drops. The metal structure also feels extremely solid.

Display and sound

The X9 rocks a 5.5-inch Super AMOLED display at the resolution of 1920*1080px. Although it is not the most cutting-edge in terms of pixel density, as most of the flagship smartphones have 2K displays now, it was still impossible for us to pick out individual pixels while using the phones in a normal distance. Putting the phones in a VR set we started to notice the difference, as my Samsung S7 Edge does look a lot sharper and more natural than the X9.

Despite the lower pixel density, the display of the X9 is still breathtakingly gorgeous. Like most AMOLED panels, the color saturation and contrast ratio here are simply great, you get very deep black and rich tones. The X9’s display looks generally more pleasing than most of the LCD panels used on other smartphones, as everything appears more vivid and alive.

Viewing angles are excellent as well, looking at the display from an extreme angle the colors are still not distorted. The brightness of the display is also great, you won’t have any problem using it outdoors in direct sunlight.

One of the major selling points of vivo smartphones is Hi-Fi. The X9 features an AKM4376 DAC to boost its audio performance. Specs-wise, this converter isn’t really so impressive as the quad-core DAC used in the LG V20 or the dual ES9028 DAC used in vivo’s very own Xplay 5. But coming from the S7 Edge, my audiophile ears did notice a significant improvement in overall sound quality when plugging in my B&O H3 in-ear monitor. The bass has a lot more punch, the vocals are crisp clear, instrument separation and positioning are as good as some of my earlier DAPs. I even asked a few of my non-audiophile, iPhone using friends to try listening to music with the X9, all of them actually said that the X9 sounded a lot better than their iPhones, although they couldn’t really pinpoint what the differences were. Acoustic nuts may still find their DAPs with Amplifiers irreplaceable, but for average smartphone users, the X9 is certainly one of the best phones out there to enjoy music.

On the speaker front, the X9 is also outstanding compared to many other smartphones. Not only are the built-in speakers louder, but the sound coming from them also has more clarity, layers and strength. Enabling the “Super Audio” mode in the settings, the X9 can sound as loud as some of the portable speakers and laptops, very impressive given the phone’s relatively small footprint.

System, UI and Apps

The X9 runs Android 6.01 Marshmallow out of the box, with a heavily customized skin called “Funtouch OS 3.0” on top. I know many folks prefer stock Android skin to those customized UIs, but vivo has really taken measured steps into developing their own UI, especially for the Chinese customers.

Like many customized skins, the Funtouch OS doesn’t include an application drawer, everything lays on the homescreens. Users can create folders to keep them in order.

And personalization freedom is what the X9 gives a lot of: You can rearrange the navigation buttons and even add extra ones. You can make the on-screen keyboard larger or smaller. You can hide the icon of the apps which you don’t want people to know that you are using. You have many interface themes to choose from. There are the so-called signature wallpapers, generated around the first initial of the user. And the list goes on.

Like I said earlier, many of the features of the Funtouch UI are tailor-made for Chinese customers, whether vivo will use a different UI on the units for oversea market is still unknown. Fortunately, this is Android and you can always install third-party launchers such as Google Now launcher to get the stock Android experience.

Cameras

Most of smartphone makers have realized now that people need better front-facing cameras for selfies. That’s why you get greatly improved front cameras on the Samsung Galaxy S7 Edge, the Apple iPhone 7 and many other flagship smartphones. However, no brand went as far as vivo did, as the newly released X9 has featured dual front-facing cameras: a 20MP primary camera complemented by an 8MP secondary camera and a moonlight flash, arguably the best selfie camera setup on any smartphone currently available. The 20MP front-facing SONY IMX376 CMOS lens is in charge of taking the picture and capturing all the details, while the 8MP sensor deals with blurring the background.

To everyone’s delight, the impeccable specs do translate into outstanding selfies. The dual front facing cameras capture lots of details and very rich colors under optimal conditions. HDR is available for those tricky scenes and it works pretty well.

The vivo X9 easily crushes other market-leading smartphones when it comes to taking photos with the front-facing cameras.

Even in low light conditions, the selfie cameras are still usable, thanks to the front-facing moonlight LED flash, which provides just the right amount of illumination to light up your face without dazzling your eyes.

The X9 adopts a 16MP SONY IMX298 Exmor camera with F/2.0 aperture on its rear. The lens offers a sensor size of 1/2.8" and a pixel size of 1.12μm, and has been commonly featured on lots of flagship smartphones such as the Xiaomi Mi5, Huawei Mate 8 and One Plus 3. The camera focuses fairly quickly, has a fast shutter and takes nice photos in general.

In automatic mode, images are not as sugarcoated as the photos taken by some other smartphones. There are no excessive amounts of contrast or saturation to the photo, and sharpness is also kept at a reasonable level. As a result, photographs are natural, delivering a very close representation of reality. Unfortunately, the rear-facing camera on the X9 isn’t accompanied by optical image stabilization, which is now a standard feature for flagship smartphones. As a result, ghosting and blurs could happen when you are not holding the phone steadily.

The camera app also offers lots of effects and modes for the users to play around with. The users are provided with 7 modes and dozens of different filters when shooting with the rear-facing camera, including the popular time-lapse photography. With the front-facing camera, the users has many different beautification functions to choose from as well.

Videos taken by the X9 look fine, with lots of details and rich colors. The phone is also capable of taking smooth 4K videos.

Performance

The heart of the vivo X9 is a Qualcomm Snapdragon 625 Octa-core processor clocked at 2.0GHz, beating alongside 4GB of RAM. It's not quite the Snapdragon 820 and 821 you'll find in those mainstream flagship Android smartphones, and the differences did show in benchmark tests.

In the Antutu V6.0 benchmark test, the X9 was returned a score of 61,544, far below the scores of the One Plus 3T and Samsung S7 Edge, and also many points behind the LG G5 SE. Only when compared to entry level smartphones such as the Meizu M5 Note and Huawei P9 lite, the X9 could have an advantage.

On the Geekbench 3 benchmark, the X9 scored 785 in single-core performance and 4,050 in multi-core. That's definitely nowhere near the Samsung S7 Edge and One Plus 3T in either category.

In the more graphics-focused 3DMark, the X9 scored 13,829 in the Ice Storm Unlimited test and 473 in the Sling Shot ES3.1 test.

In the PCMark Work 2.0 test, the vivo X9 was returned a predictable score of 4,780.

The X9 has 64GB internal storage, which is very generous considering many flagship smartphones only have 32GB storage on board. However, the eMMc 5 used here is not as fast as the UFS 2.0 used on high-end smartphones, the Androbench test scores told the difference. As you can see from the chart above, the X9 doesn’t match high-end smartphones in terms of Sequence Read Speed, but its Sequence Write Speed is actually quite similar to those flagships.

Fortunately, the benchmark scores didn’t entirely translate into real-world performance, as the X9 felt almost as fast and responsive as the Samsung S7 Edge while dealing with everyday tasks such as social networking, video feeds and web-browsing. The only difference that I noticed was it did take a little longer to install an application, and screen rotation didn’t happen as instant as it was on the S7 Edge.

Running graphics-intense 3D games, which I didn’t always do myself, the differences showed. Hiccups and lags did happen with big titles such as GTA: San Andreas, NFS17 and Asphalt 8, and we did notice significantly extended loading time and lower frame rates. With that said, the X9 still handled most of the games pretty well: Temple Run, Plants VS Zombies, Vitua Tennis and many other popular titles were as fast as they were on those cutting-edge smartphones.

Multitasking was generally fast, and the X9 could hold many applications in the background for a relatively long period of time, thanks to the 4GB RAM. Switching between applications on the X9 was not always as instant as it was on the S7 Edge, but for average users, the difference was ignorable. The internals may seem adequate for most people now, but with the upgrades of Android and many applications, how long will the Snapdragon 625 be able to keep everything running smoothly on the X9 is simply unknown.

Battery life and charging

The X9 has an irremovable 3,050mAh battery under the hood, pretty average for a 5.5-inch phone. As the X9 sports a more power-conservative processor, we actually expected it to do very well in battery life. Unfortunately, the result was just not as promising as we had hoped.

In the battery rundown test, in which we streamed full-screen videos over Wi-Fi with screen brightness and speaker volume at maximum, the phone lasted 5 hours and 38 minutes, which is 1 hour shorter than the S7 Edge’s result in the same test. In my nearly two weeks of testing, the X9 could power through a full day of moderate use, with around 30% charge remaining when I decided to call it a day. For intense smartphone gamers, carrying a mobile charger will still be inevitable.

The nice thing is, the X9’s battery consumption has been kept at minimum during standby. I once connected the phone to Wi-Fi and left it on my desk to receive messages and alerts for 12 hours, the battery only dropped 2%.

The X9 supports vivo’s very own dual-engine charging (5V-2A or 9V-2A), which supports up to 18W input, so topping up the battery takes very little time. With the stock wall charger, it only took around 1.5 hours to fully charge the phone.

Cellular and connectivity

The vivo X9 supports all major cellular networks, you can just insert any SIM card into the slot and start using the phone immediately. There are two Nano SIM card slots on board, which means the phone supports dual standby.

Like all other smartphones, the vivo X9 also features Wi-Fi, GPS, Bluetooth, and all of them work like a charm. There is no micro SD card slot for you to expand the storage, but the 64GB internal storage should be sufficient for most users. For me, the real disappointment is the missing of NFC. Users with the latest iPhones and Galaxy S phones should know how convenient Apple Pay and Samsung Pay are, and with the X9, you may never be able to use similar functions. Lots of new speakers and wireless headphones also features NFC for faster pairing with the smartphone, but with the X9, you will still need to take a number of steps to get them paired, shame on vivo!

Competitions

The vivo X9 is priced at RMB2,798 ($406) in China, and in the same price range you will find many powerhouse smartphones. Although none of them offer equally impressive front-facing cameras, they do make up with horsepower and other unique features. The One Plus 3T features a Qualcomm Snapdragon 821 processor clocked at 2.5GHz, 6GB RAM, 64GB UFS2.0 storage and 3,400mAh battery. The nubia Z11, which is powered by a Qualcomm Snapdragon 820 processor, has a breathtaking bezel-less design and the same AK4376 DAC. The Xiaomi Mi5s (Enhanced Edition) features a Snapdragon 821 processor, 4GB RAM, 128GB UFS2.0 storage, and a cutting-edge ultrasonic fingerprint scanner. Affordable flagships aside, many mid-range offerings run more capable chips like the Snapdragon 65X. Even the X9’s predecessor- the vivo X7 - is powered by a Snapdragon 652.

Verdict

For $406, the vivo X9 represents a really attractive mid-range offering. It has a simple and elegant design, great build quality and while performance isn't quite up to the level of its similarly priced rivals, it offers fantastic acoustic experiences and arguably the best front-facing cameras on a smartphone.

If you are looking for a future-proof powerhouse handset which will do very well in benchmark tests and intense 3D gaming, there are many affordable flagships out there, some of them priced even lower than the X9. But if you rank selfies and music as your top priorities, and horsepower is far down the list, then you won’t be disappointed with the vivo X9.