I love my dremel and it has proved to be an extremely useful/versatile tool. Not sure if I would like a cordless version or not. I don't like cordless versions of tools unless I absolutely can't use a corded tool. If you don't have a dremel, this is a worth while investment

#1, this Dremel tool is more like a sander and not a rotary tool.

I own both an 800-series Dremel Lithium Cordless and a Dremel XPR400, and use the cordless far more than the corded XPR400. Battery life is good (plus, I own two batteries) and the tool cuts pretty much anything that I want to cut. The only exception is I've got some older, heavy gauge steel computer cases to which I've been adding 120mm fan holes. The cordless is too weak for this job, but the XPR400 doesn't fair MUCH better as it's usually smoking and super hot by the time I finish with a hole. It's not that I'm abusing the XPR400 so much as it's simply not the right tool for the job.

The only other negative about my 800 is that I've got a few Dremel attachments that fit the XPR400 but not the 800-series Cordless.

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I have to say that using a cordless isn't that much of a negative thing. You should be using real power tools if you need to do something heavy duty. I consider the dremel more of a light tool. Finish up edges, cut/drill small holes, things like that.