Haven't blown a single controller have fried 3 motors by getting the rotor too hot which causes them to lose magnets. Problem on both gen 1 and 2. I was only running to like 8k rpm. Some clowns brag about doing 11K and 6kw power and lol, there is just no way their bikes do that for anything other than exhibition purposes (short output duration without overheating and failure).
Other than that I have lots of miles and the motor is very reliable if you don't get it too hot, or spin too fast.
Solutions when trying to "race" and be always on power without blowing a motor include limiting power to <3kw and avoiding start / stop and low RPM.
I still have to take breaks with my bike on a 800Wh battery, and I would like to install some kind of evaporative water cooling for the shell. That will let me give full power for a single stage, which is under 10 minutes.