Review (5/5): It will  pay for itself with what you save at the dentist!
I've used an older model for years and this one for several months now. This is definately an improvement, but the old one worked well also (and still works for my daughter). I only go to the dentist when I have a problem, so this does a great job of keeping my teeth and gums in top shape.
It makes my teeth feel really smooth.
The last Comsumer Reports that I could find (August 1998) rated the Braun Oral-B #1. However, it also said that you could do as well with a manual toothbrush if you used it properly. I brushed so hard with a manual toothbrush that I broke some of the brushes. I also wore a groove in the base of my teeth just above the gums.
This gets my teeth cleaner and smoother than I could ever get them with a manual toothbrush.
The Sonicare also looks like it would do a great job (Consumer Reports rated it #4), but it costs about twice as much. And the replacement brushes also are much more expensive. You might want to check ebay also.
I would never brush for the full two minutes without the timer that is on it. But, it is easy and it works well. I also brush my gums, tongue and the roof of my mouth without any injury or soreness.
I really feel that you'll save enough at the dentist to pay for this several times over. Give it a try, they offer a money back trial period.