jimv said:
Let us know what you think after you spend some time with it
It ended up coming in a day early so I've had it since around noon.
I'm coming from the S4 so the layout is similar although the interface feels leaner and sleeker, which may just be from the more recent version of android. The screen on the S6 is much brighter and easier to read than the S4 while on the same brightness setting. As expected, the S6 is noticeably quicker when opening/closing apps and browsing the web.
The phone itself looks and feels like it is made from much higher quality material, which is a big plus. The S6 is a bit taller than the S4 due to an increased bezel on the top and bottom, I'm guessing to support the finger scanner. The finger scanner works pretty well, better than I expected actually, but its still not as smooth as apple products. On occasion it takes a few attempts to read your finger correctly but it usually works on the first try.
A few other changes I noticed from the S4 seem to be that the power button is now about 1/2 inch lower on the right side and the speaker is on the bottom of the phone instead of the back which makes more sense so you don't muffle the sound. The camera on the back sticks out further on the S6, they also added a shortcut to the camera by double clicking the home button twice which is a great idea (again not sure if android or samsung though).
I've taken a few pictures to test out the camera and the pictures look very good so far. I've only made one call but the sound quality was solid. My S4 has been having battery issues lately so I'm looking forward to testing how well the S6 holds up with a full day of use tomorrow. As has been mentioned in all the reviews, there is no SD slot and the battery is not accessible in case either of those are a deal breaker for you.
edit: Thats a good point about the heating issue, my S4 would definitely get too hot when charging and doing too much processing at the same time. I did notice that when I was charging my phone and downloading a bunch of apps that the phone did heat up but not nearly as bad as the S4. When just charging it doesn't heat up at all.