Review (4/5): A real work-horse
I've been using this model of the Oral-B toothbrush for almost 2 years. It works great, but I do find the timer feature to be quite annoying. The timer activates at least 2 or 3 times during my brushing session. I'm not quite sure what purpose it serves, and there doesn't seem to be any way to deactivate it. Mechanically, this device has worked flawlessly. I've had no problems with it maintaining a proper charge, and all of the brush heads (I've gone through a couple of dozen) have worked without any malfunctions of any sort. Best of all, my teeth are cleaner and whiter since I started using this product.