It's fantastic and fast. I've played over 2k games on mobile devices, and it's LOADS faster than mobile Chrome, plus you can quote/highlight which is fantastic. It also doesn't autozoom when you click on a chat box which is nice.
The only thing I don't like is that it needs a better connection usually than chrome or safari, and I'm having trouble clicking things. For instance, I'm having trouble editing my post, and this track pad will take getting used to to click on some things. But I'm gonna try playing on this browser and get used to it pretty soon. Highly recommend.