The Oral B Cross Action toothbrush is the first mechanical toothbrush I have ever used. At first it was hard to get used to the vibrating sensation, but after the first week or two it was great. I did notice after the first usage that my teeth felt cleaner than with using the traditional manual brush.
The head of the toothbrush is shaped in such a way that it wraps around back molars completely. The longer portion of the brush also reaches down the sides of the other teeth to give a great brushing all over.
I have left it off the charger for about 3 days before it needs another charging. Although the brush will still turn on and vibrate fast at this point, once you start brushing your teeth with it the head will slow down.
I would recommend this product to others for a great, professional cleaning.