Personally I think the Dremel is the biggest waste of money I've ever spent. It's too underpowered and weak to do anything worthwhile. The bits are too expensive for something that usually lasts a few minutes a piece before wearing out or falling apart on me. The cutting discs are way to fragile to cut anything harder than balsa wood or thicker than a beer can. I tried cutting the bottom off a 5gal plastic water jug to use as a hopper for my mill. After cutting approx 8 inches of plastic, I had already had 4 cutting discs snap on me. I finished the job with a hand saw, and finished it in half the time as the dremel cut the first 8 inches.
Every time I think I have a great job for the dremel, I always end up getting frustrated by its total crapiness, and go get a real tool to do the job. Short of small crafts, and tiny little detail work, I have found it to be a totally worthless addition to my tool collection. You see footage of the thing on TV, polishing and cutting through metal, and doing all kinds of heavy duty jobs, but I have found a combination of a sawzall, angle grinder, basic hand tools, and common sense, will get you alot further with most jobs, than with a dremel.
Now that is just me. Maybe you'll be completely happy with the Dremel, and it will do everything you ever wanted it to do, but I felt the need to break out my festivus poll, and air my grievances.
