It may be my fault but I used it to cut holes for recessed LED lights in the shower. So I used it to cut through a cement board and it worked great. The problem is that after this job I tried to use it to cut wood and it couldn't even go through a 1/4 inch board. Basically he was "burned out" but only with a TON of pressure. Again, maybe I shouldn't have used it on a cement board, but I wanted to warn others about what I stumbled upon.