I have 2 of these ESC, the Black one and the TRF Blue one. I run only mod class and this ESC is excellent. However it lacks rpm on high side this will only become obvious if you are running on a track that has long straight, not a problem on small to med size track. The best thing about this ESC is it can run sensored or sensorless motor, even if you are running sensored motor and somehow the sensor wire detach itself during running, it will still be running as if nothing is happening, it will switch itself to sensorless mode. One more thing, this ESC is the easiest to be set, no lights to be counted and no PC is required, just plug in the card and select whatever set up you want. Overall a very good ESC.