Personally, I love it for Souls games. The right touchpad works better than the analog stick for camera control (even though that's not such a huge deal for Souls), and more importantly the grip buttons are a godsend for my playstyle.
Indeed. I can't imagine playing Souls games without the grips anymore and the camera control is nice.
I still have more problems with fast FPS games. Like Shadow Warrior 2 - it's fun with the Steam Controller, but vertical aiming is still off for me (I tweaked and tried for hours) and the ergonomical problems do not help with fast button presses.