I'm a handyman and the spindle sander is one of the main tools in my workshop. These are really good sanding guns, especially for the price. I use home stock Diablo brand sleeves (my machine is a Ridgid belt/spindle sander) and they're great, but you can't get an extra fine grit there. I received and used it today and am very happy with it. Tip: Use one of these rubber sandpaper cleaners often and they'll last quite a while.