The vacuum assist PNEUMATIC sander failed to live up to my expectations .Despite its claims of being able to handle tough industrial jobs, it struggled to remove even basic layers of paint. On the plus side, it was lightweight and easy to maneuver. However, the cons outweigh the pros, as it simply doesn't seem capable of doing the job it was designed for. I would advise anyone in the industrial and scientific fields to look elsewhere for a more reliable sander..