I bought a Dremel 20 plus some years ago ran smooth, but continual switch, problems dust would get into the switch, air/ dust blower was weak so I added a fish tank air pump to assist, blades kept slipping out of the clamps until I made a tool to assist in tightening them. Once these frustrating problems were overcome it was a great tool for outside cuts but patterns with interior cuts became a pain as one has to reach to the back to tension the blade each time and the arm could not be raised so threading the blade through holes became tedious. It has taken up space in the shop for about 8 years now .