Review (5/5): Excellent cleaning action.
The specs are there for you to see, and I'll just say that the Oral-B Smartseries 4000 lives up to each of them. I have been using the 4000 for a couple months now and have found it to work just as good (if not even slightly better) than the [[ASIN:B00132FUNG Water Pik Sensonic Professional Toothbrush]] I was using before.
The bells and whistles are nice; timers during brushing and also a warning if you're brushing too hard. What I really care about, though, is how clean my teeth feel and look after regular brushing. In that respect, the Smartseries 4000 performs with the best of them.
Replacement heads aren't cheap. In fact, they're slightly more expensive than the Sensonic replacement heads I used previously. Still, the brush performs up to my expectations, so the clean teeth and feeling are worth the price. Overall, I can definitely recommend this brush!