I've burned through about a half dozen Dremels over the years. The flex shaft is handy for some jobs, easily removed when you don't need it. A friend of mine has the Dremel version of the Roto-zip. It came with a flex shaft that uses all the dremel accessories. Looks like that setup would be a lot heavier duty but kinda limited to flex shaft only. The Foredom is a nice professional quality tool, and priced accordingly. If I had the cash I'd have one.