I bought one when they were here before (not during the woot-off, before that). I like it. It does pause for like half a second every 30 seconds, which I don't find irritating but others might. It does get your teeth super clean, even compared to the normal battery-powered kind.
But if you have sensitive teeth, you need to use these in the sensitive setting. I didn't for the first week, since I figured that a faster speed isn't going to hurt my teeth, but after a week my teeth were hurting again (even with prescription toothpaste), so I started using the sensitive setting, and now they don't hurt.
I also like that it lights up red if you press too hard, since I have a problem with that. Pressing too hard doesn't improve cleaning and wears out your bristles faster, so it's really useful.
The only downside is that both brushes are the same color, so if you have one for each you and your spouse, you're going to have to do something so you don't mix them up. We store ours' in the cases when we're done (you're supposed to remove and dry the brush from the handle after every use to extend its life), so I just used nailpolish to paint a stripe on one of the cases, and a tiny dot on the handle of my brush just in case it's left out of the case.