Ok had it for a couple of days now, coming from a Note 4. Summary: I LOVE it.
Pros:
Performance: Much smoother, faster and more fluid experience - Software is so much better - stock like performance.
Screen: is gorgeous, not as punchy as the Note, but beautiful just the same.
Feel in hand, this is a very very well designed phone for a large device.
Speaker:... seriously... even though its rear facing, it sounds full and weirdly projects sound so it sounds like its coming around the phone (unlike the note)
Camera: Shots are gorgeous, and playing with manual mode is hella fun.
Cons:
Battery:Best i can get over the past two days is 3 Hours SOT - Note would get 4-4.5... will continue to monitor and report
Camera: HDR processing takes longer than the Note, and Video OIS is very jello like. Also, the screen doesn't automatically increase brightness like samsung phones do, so sometimes the viewfinder shows a darker image than it is taking.
None
Thats it, I'm happy...for now. I tend to change phones fairly often, but If i can get the battery to improve to around 4-4.5 hours SOT then I can see myself hanging onto this for a while