Inexpensive and effective
It's inexpensive and does an amazing job at cleaning your teeth.  Plaque build up is greatly reduced and your teeth are left feeling infinitely cleaner than any manual toothbrush.  I cannot understand the price difference between this and the higher end models.  The only thing to keep in mind with this is that you should not press the brush head too hard against your gums - the action is strong enough to cause irritation and strip the gums away from your teeth if you are overly vigorous with it.  That said, it does such a good job cleaning that everyone should have one.
Rating: 5 stars