I love my Black& Decker Matrix system. But I do abuse it. I ask it to do heavy duty work when it's designed as a consumer grade product. That being said, I have burned up the motor in the power unit twice. The good news is, it's not very difficult to replace. I found a compatible RS-550 motor for less than $13 on the usual on-line sites. Do your best to look at the output shaft of the motor you are considering to make sure it will accommodate the drive gear from the Matrix power unit. When I burn up the most recent motor, I may try to replace it with a brushless. The advantages are significant, but so is the price at $68. Best wishes,