I have installed my Monster in my BL XT8 with 5S Polyquest 4900mAh LiPos and a Plettenberg BigMaxximum with a 15t pinion.
The Controller is just awesome. It is super smooth and has ultimate punch at the same time.
Check out these videos to get an impression of my baby ...
BL XRAY XT8 onroad cruising
BL XRAY XT8 on offroad track
So far everything is running just fine - I am just hoping that I got one of the good ones ...