I got to use both device for a day and my impression of the S6 Edge isn't good. The reason being if you spend a lot of time reading on your phone you will have to deal with shadowing on both edges and light refraction from strong room or natural lighting. Normally you can shift the angle of your device to compensate, but not on the Edge. Battery life isn't horrible but not great, if you are a power user you will not get a full day of usage.
Also, the Edge isn't that comfortable to hold, even using my Spigen case. It also has more of a polished edge like the Note 4 that is prone to scratching. The Standard S6 has a very small polished edge that will hold up better over time.
I am getting the normal TouchWiz delays once both devices had my apps loaded(approx. 60 apps.) I was a little let down by the new flash memory in this device, Google app updates are not any faster to install than the Note 4. Startup speed is a little faster, but most apps load about the same speed as the Note 4.
The Edge features are not worth the sacrafice of screen quality and usability. The glowing feature is cool and quick contacts access, but again if you use your device for reading you will not like the trade off.
The Standard S6 and Edge are surprisingly light, and the Standard S6 is very comfortable to hold and use one handed. The Edge I have is Black/Blue and the Standard is Pearl White. They are both finger print magnets, but the white model doesn't look so bad after usage.
I will probably keep the Standard S6, but really hoping battery life will improve with updates.
Cameras on both units are slightly better than the Note 4, in low light, but same quality in standard lighting.
Both units are TmobIle branded with the recently released update.
I have abut 2 hours left with the devices before I need to turn in the Edge model.