i own 2 rotary tools
i have a plug in dremel multi-pro model 285 two speed, (15,000/35,000 rpm) and a "king" brand variable speed. the king is the one i prefer. it has more balls. however the dremel is alot smaller and nimbler than my king. then again i treat the king like its a 4 1/2" angle grinder.
its all in the selection you build, and as for the ****ty little bits. buy the biggest kits you can find on sale... because whenever i take mine out i chew up a couple on any good project lol
..... which reminds me. i have to replace that ****ty angle grinder i bought......