I have had my dremel next to boostys.
all said. The black and decker boosty has (a search would provide the model number etc) is not a bad piece of equipment for the price.
I have seen that thing smoke enough to fill his basement and garage (they are connected) and it was still powering on.
If I were to buy a new one, I would have to seriously consider a B&D. or the new dremel with a 2amp motor
(XPR or some combination of letters like that)
definately not a bad unit for the price.
Personally. I have put my dremel to hell and back, had it to the point where it wouldn't even spin on its own power. I replaced the brushes and cleaned up the motor and it works almost as good as new. It is currently employed in cutting drop ceiling tiles which makes a LOT of dusk and it is working strong.
Both are good brands (IMO) and both should provide long service in my eyes.