Raced mine pretty hard yesterday and Saturday with no problems. Outside temps about 80 degrees or so. Temps never got about 130 on the ESC yesterday running 5s with a 1515 2.5d in a buggy. I took the stock fan out as I broke the fan plug within the first two minutes of racing and put on a Novak 30mm running off the receiver. I also dremmeled out the grill to prevent it from catching the fan blades. The ESC works PERFECTLY right now.