Okay... I tried these settings for a good 4-5 hours solid last night and can honestly say, I don't know how people think this is better than the current ST/Expo Ramp...
I mean, it felt a bit more floaty and there's too much swiping of the mouse going on to do quick 180 turns, so with characters such as Tracer/Genji/Bastion it was too much arm work going on.
The only thing I did like about it was with Soldier, it felt a bit more easier to keep a steady horizontal aim on ground targets, however, it felt like more arm work when sprinting and also it felt worse when trying to aim at targets that were vertical from you, like Pharahs or if you have the high ground shooting enemies below you.
I much prefer the current ST/Expo ramp settings, you can do micro aiming really well with that, plus do quick turns without having to swipe the mouse massively.
My Settings:
Current Overwatch ST
12K DPI 1000HZ
Aim Assist 100 (All Characters Except Pharah Which is 0)
Aim Assist Window 0 (All Characters)
Aim Smoothing 0
Exponential Ramp
XIM4 Sens HIP: 7
No Curve
No Boost
X/Y 1.5
Steady Aim: On
These settings feel best for me, and they work with every character.