I'm voting yes with my money that they are worthy tools to own. :thumbsup:
They are so very wonderful at being able to get into tight places that neither anything with a rotary blade can or that a sawzall type reciprocal action will mess up surrounding area while trying to especially start your cut.
I'm actually trying to decide between the Rockwell version and the Fein.
I've used the Dremel, friend owns one, and it is a neat little tool but definitely aimed at the weekend warrior and home DIY'er. Blades are almost to flexible and don't last real long on hardwoods, but they are also cheaper to replace. Might be a wash, but I doubt it.
The Rockwell feels more like a pro's tool with fit, finish, and heft of metal parts where it counts. The Rockwell big kit, far as I've found is around 75 piece. It comes in a duffel bag; I HATE duffel bags for tool storage. That alone almost makes me want the Fein for it hard plastic case. On power though, the Rockwell is 2.3 amps and Fein is slightly less at around 2.17 amps(if my Watts conversion was correct, 250 Watt motor).
The Fein was the original and it has some better features. The quick change blade system seems light years ahead of the rest. Most use an allen head bolt or some variant that means the key/wrench is usually not with you when you want to change or alter position of blade, or you've lost it all together. I've mentioned the case already. Also, it seems to come with the most stuff if you buy the Top Plus version. The blades are definitely more expensive, but if they last 5x longer, you might be money ahead in the long run.
Now if only Amazon would do their year no interest with their card, I'd be all set and it'd be an easy decision to make.