I've used both the 35a & 60a versions for racing 2wd buggies. Both seemd to work well in my xxx-cr. Only reason I got the 60a was so I could remove the fan for a better fit in the car. 60a does get warm after 5 min heats but never too bad. Running a 13.5t novak (gets very warm). Only differences with other cars I've noticed is my low-speed control can be fairly twitchy, and a very slight delay when punching the throttle. I'm guessing cause it's sensorless esc with sensored motor. But hey, I came 2nd in the B-mains - not too shabby.