I have had a dremel for years.
My old man called it 'the best tool he never bought' as he was the one using it when I got my hands on better gear, like grinders, drill press with flex drive, cordless drills etc.
It has its place in the home workshop of the lay-man, but if you were going to buy it for one purpose with the mind to use it for anything other than light duty use... just get the appropriate tool.
Air die grinders can be had for $50. 240V units by the big brand names can be had for a couple of hundred- cheaper if used.
Angle grinders are <$40 for a cheapie, and thin wheels had for <$1 a round in many cases.
A flex drive for a drill can run a multitude of small wheels and buffers on a mini chuck, and holds up to way more abuse.

