Professional Tool. I'm a mechanic and do body work on the side. You can use this grinder all day long without getting tired as it is well balanced. You don't feel the vibration tearing your arm like you do with some cheap models. Remember that you need a good compressor to meet your air needs just like any other air tool. The clips for holding the sandpaper are of high quality. I use it to sand with wet paper and water as well as dry and without water. It's up to you how to choose the right sandpaper for the job and how to hold and work with the tool to get the best results.