I'm surprised there's no feedback on this one. The only model I tried (I don't remember the brand) had a rotating head, and got surprisingly little reaction; I was wondering if vibrating ones work better.
I've found that the cheap children's electric toothbrushes can be quite effective as well (of course depending on the sensitivity of the lee). I've dished out some torture using Dora the Explorer as my minion of tickle evil .........however, I'm in the market for something a little more heavy duty and I've always heard Sonicare from others on this forum. I should be testing it out sooner than later.