[OnePlus 2 Q&A, Help & Troubleshooting] neatojones:
I went from GS6 to a oneplus 2. I originally kept the GS6 and sold the Oneplus 2, but later changed my mind and bought a new Oneplus 2. (I don't understand all the whining about not being able to buy one!)

Here is why:

My main complaint regarding the OP2 is its size. The S6 is sleek and lightweight. When it comes to having one of the two in a pocket...I much prefer the size of the S6. But, phones aren't made for sitting in our pockets, are they? Also, I find the vibrating motor on the OP2 is lower quality than the one on the S6 and so I leave it turned off because it annoys me. The vibrating seems to slow down the use of the keyboard to me as well. I also don't find the quality of accessories like cases to be as good for OP2 as the GS6.

On the other hand:

I don't mind the lack of NFC because I don't keep a phone unrooted long enough to use Android Pay anyway. I think Oneplus realized most of it's users would be in that boat. I also don't mind the lack of quickcharging because I just plug in my phone everynight and I have a 15,000mAh battery charger that bought just in case, but I have used exactly 0 times. Despite all of the horror stories on these forums, I have stock Oxygen and stock kernel and get to the end of every day with about 75% charge left.

I think the TW on GS6 is fine, but I honestly prefer the stock experience. I found the camera on the GS6 to be better, but I would ALWAYS choose my DSLR for any serious video or photo of either and I don't find it $150 dollars better (The actual price difference if you watch for deals on websites such as Slickdeals).

I hear all sorts of whining about the quality of the hardware being less on Oneplus 2, but in the past half year I have owned 3 GS6 devices and two of them had to be sent in for RMA warranty. I have owned 2 Oneplus 2's and they were both without any faults. Also, if you think that Oneplus has software issues, you should see all the whining over on the S6 forums about the software problems. Samsung is arguably the most advanced android maker out there and still regularly have software issues! Samsung does not support the Dev community and takes every action to prevent any software modification (Ever heard of a Knox?). Oneplus has limitations on what they are able to provide the community with regard to drivers, but does what it can.

I used the fancy features like heartbeat sensor and pulse ox a total of once just out of curiosity...never found a need to use it ever again. The same goes for the remote control. It is a neat feature, but I would prefer to use my regular remote.

I also can't see the point in using Android Pay because it seems like half of all retailers out there still make me pull out my wallet to show my ID. Basically, at this point the Android Pay is about the same level of novelty as a 4k screen on a 40 inch TV and I'm fine without it. I can't drive anywhere without my wallet because it has my license, so I might as well carry a card in there too. If I go to a restaurant, I'm not going to hand a $400 to $650 device to the waiter to pay for my food.... With all of it's limitations, Android Pay just isn't THAT much of a convenience. So, I will choose to root my phone and do without out it whether the device has NFC or not.

The GS6 Super OLED is beautiful, but comes with drawbacks. One main problem is that they suffer from burn-in. I had one device that I couldn't stand using because it developed a severe burn in from having a background similar to the "never settle" on the OP2 that left words visible on the back of the device. The burn in occurred after a couple days of heavy use of the device and was permanent. Samsung will not fix that problem on warranty...they see it as your fault. IPS does not have this problem. With regard to battery use I don't think that the benefits of OLED outweigh the significantly larger battery on the OP2. Also, I should mention that I have a smartwatch so I could care less about features like having alerts popup on the display, but I doubt that this really consumes a lot more energy on the IPS displays than the OLED displays. I believe that more energy is probably being consumed in the wakelock anyway from those sort of events and really don't want my screen turning on to tell me about new alerts either way. I saw a fancy graph somewhere about how OLED really doesn't use that much less energy compared to IPS with LED anyway, and can actually use more in certain cicumstances.

I find that the larger real estate of the 5.5 inch screen on the OP2 is a better size compared to the S6 in my experience and don't appreciate any decrease in quality in the 1080p vs 2k.

The S6 and Oneplus 2 are both pretty lag-free experiences. I do like having the 64gb of space compared to the 32 on my S6, but the OP2 seems to run with about 2GB or RAM free, so the 4GB or RAM is probably overkill. The S6 on the otherhand is bloated beyond belief and uses every bit of the 3GB of RAM. Anyone who has spent time on the S6 part of xda has seen tons of complaints about this. Meanwhile, OOS isn't perfect, but it does remain a bloat free experience.

Importantly, the dev support for OP2 is much better and we really owe these guys like Grarak and AK for all their hard work. Dev support for the S6 is very limited. CM will probably never be available for the S6 because it uses the Exynos.

I never had a problem with using the physical home button on the S6, but after using the home button on the OP2, I found that I was annoyed everytime I had to actually press down on that physical button on the S6. I don't know why, but it really bugged me.