[Oppo N3] Lum_UK:
Largely agree with the above.

The good:

The phone is overpriced. I pre-ordered from OppoStyle and got a free VOOC battery pack, 32GB SD Card, and an iLike case for it, so the price of £430 actually felt ok, but without those freebies I'd feel a little bit ripped off, and that offer is gone now.

The camera is fabulous, only taken one selfie with it so far which was after a 4 day long course and 140 mile drive home, no makeup and really tired, but still somehow made me look good: http://lum.uk/temp/IMG20150122211859.jpg

The shutter speed on the camera is really fast too, so great for taking cat photos. http://www.imgur.com/p5dwFqR.jpeg

Dual-SIM on a flagship phone is wonderful. Work have me using a Blackberry Curve with a data bar on it and only Blackberry services allowed, so I've never been able to shove my work SIM into an Android and still get email before. Words cannot express how much I hate that Blackberry but I can't even dial on it without either using a pen to poke the keys, or end upbreaking a nail.

Color OS is actually surprisingly nice. This is the first Android I've owned where I haven't felt the need to immediately rip out the entire OS and replace it with Cyanogen or AOKP (My previous androids were an HTC Desire Z and a Motorola Droid 4). I've still had to replace the launcher with Nova Launcher though.

VOOC charging is really clever. I read a bit about how it works, the phone basically has 3 batteries and charges them at 1.5A each, so it's not going to kill the battery too fast. I really don't mind that a standard charge is slow. I charge it overnight at 2.1A from a USB mains socket by my bed, so that'll be 0.7A per battery which is going to make it really nice to the batteries longevity.

Battery life is superb. Even during a day of heavy use, my second day of owning the phone, including much tinkering, gaming and also using a lot of data in the doctor's waiting room, it was only down to 40% by midnight.

The "Skyline" notification light is actually quite good in these days of LEDs that are far too bright, however whenever I see the name I always think of a Nissan, not a fancy LED.

An SD card slot on a high end phone released in 2015!

The downsides:

The dual-SIM layout is slightly odd. It takes a micro SIM as its primary and a nano SIM as the secondary. 4G is only available on the micro SIM, not the nano!. This strikes me as an odd decision as nano SIMs are more likely to be 4G capable, and to be the primary SIM for the phone, with the larger SIM being from a crappy company phone. Fortunately for me my girlfriend is very good with a craft knife and the Blackberry SIM is now a perfectly good nano SIM. I guess some folk would rather use up their works data allowance for everything and then stick in a personal nano SIM for calls.

The position of the power button is annoying. I keep grabbing it and locking my phone when I want to just hold the phone. I wonder if there's a way to make that button unlock only, not lock, as I can lock it by either closing the case or double tapping the home button.

Opening task manager by doing a long press on menu, rather than home, takes a little bit of getting used to.

The Oppo widgets only work on their own launcher. I had to install Google Calendar to get a working calendar widget, which then left me with two calendar entries in the app drawer.

There is still a little bit of bloat to be removed. Google Chrome should not be baked into a ROM as it's 80mb and is almost invariably out of date when the phone ships, plus I use Firefox anyway, also the above mentioned oppo calendar.

There's a hidden app with the name still in Chinese that had me nervous at first as I had no idea what it did. Turns out it's EngineeringMode.apk and is triggered by *#*#4636#*#* and has a few things to tinker with, but use with caution.

No kernel source code available, no fastboot files available. This is especially annoying given that the OTAs failed for me.

Most information about the phone, and about ColorOS is only available in Chinese.

Non-removable battery.

SD card can't be used at the same time as a second SIM. I wonder if careful shaving of both cards could get around this, but unwilling to try it as getting a card stuck in that slider would basically ruin the phone.

The SIM slider can be completely removed and if you lose it you have a £430 tiny overpriced tablet!

All in all I'm quite happy with my purchase. I'm not sure it'll do that well as the phone doesn't know what it wants to be. The dual-SIM thing is great for business people, but the selfie camera is obviously targeted at young women, yet the size is likely too big and they're competing with Samsung who actually have physical shops in the UK. They're also doing zero marketing. For me it is (almost) the perfect phone*, but I'm weird and have multiple often contradictory requirements. I love it but not sure I'd recommend it to anyone else.

* for it to be perfect it would have to have a 5-row QWERTY slider. This is my first non-QWERTY phone and I'm struggling with typing having come from a Droid 4. Guess I need to look for an external keyboard.