If you only plan on buying one Dremel tool, the Dremel 7700 7.2V two-speed rotary tool is the one to buy. This is by far the most versatile and easy-to-use Dremel tool I have ever operated. It's cordless and lightweight, which makes it easy to grab and take anywhere you need to go. But its battery is long lasting and powerful enough to get most small- to medium-sized jobs done without recharging.
I have worked with Dremel tools for variety of projects, and I'm fairly well versed in many of their uses. But I decided to test drive the 7700 model for something I had never used a Dremel before – sharpening garden tools. I expected this job to take maybe half an hour at max, but I had two sets of bypass pruners, two sets of hand bypass cutters, and two sets of lopping shears sharpened in less than 10 minutes. Yes, there was a bit of a learning curve (I occasionally went off the edge – as you can tell by the before-and-after pictures), but within seconds these tools had a sharper edge on them than they had when they were purchased! The battery power held up very well for this job, too. There was no noticeable loss of power from the first tool until the last.
Two things to note. If you do use this as a sharpening tool, you MUST wear eye protection - the sparks can be impressive. Also, I'm not a big fan of the garden tool sharpener. It was designed to hold the Dremel at the proper angle for an optimum edge. But it didn't work well with the curved blades of the bypass pruners, so I just “eyeballed” the edge with a grinding wheel, which worked just fine.
Unless you're doing a lot of in-place, heavy duty grinding, sanding, or drilling (think carving rocks for jewelry), forget about buying a corded Dremel and go for the cordless 7700. You'll be glad for its versatility (it comes with a nice set of accessories for lots of different jobs), durability and, most of all, ease of use. [This review was collected as part of a promotion.]