Only used twice for a total of about 30 minutes. Today after 5 minutes it started smoking and stopped working. I'm sending this back and although I'm the main contributor it will take two days so my work will be delayed by two days. It was smoking heavily, as if it was about to catch fire. I also replaced the carbon brush after it had cooled down for a long time and it started smoking again. If the replacement does the same after that little use, I'll send it back for a refund. (The exchange worked better than expected, so I recommend using KAVEAT EMPTOR. UPDATE: I opted for an exchange rather than a refund because I had to finish the job. The exchange worked much better. The engine ran much smoother, which made it made it quieter because it didn't vibrate at all. So I got my job done very quickly. Now I'm looking forward to my next job. I changed my rating from one star to four mainly because of the great customer service I got from the seller, and then i tried their best to make me happy and of course the replacement tool works beyond expectations i would recommend this tool for DIY enthusiasts.