I bought one of these (a Fein, because they still had the patent active) a number of years ago. I got it primarily because I was doing a lot of refinishing at the time and wanted something to sand out details and moldings. Well, it turned out to not be so great at that, so it's mostly sat in the tool bag, Today, I was trimming off some dowels with my flush cut hand saw, going slowly and I had a bunch to do, so I dragged out. Wow, I have to remember that more often.
I guess I've always considered it really handy for a remodeler, trim carpenter, electrical rough-in, or a p