Had play with a OnePlus 3 over the weekend.This is a very nice phone. The 6 GB of RAM ensures there are no slow downs, pauses or wobbles. I didn't even really notice it's the screen is only 1080
as it is bright and the colours are vibrant, not as vibrant as my Galaxy S7 Edge but still very good. The alloy chassis is very well built and the screen molds beautifully into the body. The Oxygen OS is a good version of Android and looks and acts very much like stock Android.
The down sides were...
1. No MicroSD support
2. The camera is OK, but not great and certainly not as good as say the S7 Edge, iPhone or Huawei P9 Plus.
All in all a great phone for the price.