Works great.
I've had one of these for nearly six months now and it's still going strong.  I've always been something of an over-brusher and thought I was doing fine with my old manual toothbrush, but was amazed at how much cleaner my teeth felt after the first use with this.  I still can't get it done in the 2-minute timer period, and generally take at least 4, so I figure this unit has actually done double duty this past 6 months, and it's still going strong.
Rating: 5 stars