Review (4/5): Couple of issues
This is my third sonicare, so I obviously like this product overall and how it performs. The one thing I don't care for on this model is that the handle is a bit too thick, in that it feels large in my hand (and I'm a 5'8" woman), so if you're smaller than me, it might seem uncomfortably large for you, too. I believe one of their other models has a more streamlined handle.
The other thing is that you need to be careful about how you push the little round rubber on/off disc. DO NOT USE YOUR NAIL IN ANY WAY. The only reason we had to buy a new one was that the button got wrecked and pushed into the handle so that we couldn't access it anymore. Mind you, this took about a year and a half or more to happen, but if it had been a better design it wouldn't have happened at all. If you're careful to use just the soft part of your finger you should be okay.