I originally bought the compressor because it was much quieter than any other I could find. It worked very well for a while, but then wouldn't start because it was trying to start against the pressure head. The relief valve wasn't working. Since I live a two hour drive from the nearest service center, it would have been two hours up, two hours back, wait for several days and then two hours up and two hours back, I decided to see what I could do. With a little shaking and banging the relief valve let go and we were up and running. This was good for a month when it just plain stopped. Faced with the same scenario I decided I'd take it apart and see if I could find the problem. (I've done this with many problem machines in the past.) I found that one of the brushes was hung up. I monkeyed with it and got the brush to seat and off it went. Good for another couple of months. Stopped again. Same problem. Ordered new brushes, but when brushes hang up or bump on the commutator the commutator is damaged so this fix might not work. The brushes sent were the wrong ones, but they don't offer any others so I tried them. No go. So I decided to order a whole new motor assembly. Guess what. The motor assembly costs $235 plus shipping. Now if you didn't notice, that is more than the cost of a new unit. I tried to point this out to the folks at DeWalt, but never got any where.