Used for about 30 minutes. It's practically new. I'd heard good things about the brush, so I tested it out while driving! As stated on the Rock'n Crawler site, where it was ranked as the best in a motor comparison, the results are fantastic in terms of control. Low speed and torque are stable! It was a smoother motor than other 5-slot motors, without the jerkiness. I compared it to Holmes Hobbies, which is said to be good, and they both performed equally well!