Who's using one?
I've found that mine has almost completely replaced my actual router. It does everything that my router does, in a smaller package. The router has been relegated back to being bolted into its table. I haven't even used it at all on my 2 current projects.
I've got an actual Roto-Zip brand Rebel (which just broke.

Probably not under warranty any longer so I donno if they're repair it.) and a Craftsman rotary tool. Love 'em both.
If you've never seen one, basically it's just a shrunken down router or a Dremel on steroids.
http://www.rotozip.com/I've used mine to make straight cuts instead of a circular saw, curved cuts instead of a jigsaw as well as routing insets & cutting T-molding slots instead of a router.
D