Very good electric toothbrush, perhaps not the quietest, but it's not like I've tested 20 different brushes so can comment particularly incisorly, scuse the typo pun...
Lots of other satisfied people, but I'm writing this review 14 months after owning and unfortunately it has gone wrong. It seems that the coupling pin between the innards and the detachable toothbrush head has become defective and no longer delivers the vibration correctly to the toothbrush head.
Note that there is another of this type of Phillips HealthyWhite Deluxe toothbrush for sale on Amazon which seems to be the same brush, and this brush has quite an unhealthy proportion of 1 star reviews because of defective brushes putting people out of pocket - sounds like mine's got a similar fault.
I'm sure that if you buy one of these and it keeps working for 5 years, you'll have got your money's worth, have saved bills at the dentist and have better looking teeth. Do factor in that brush heads will cost you £10-15 a year on top.
So, a love hate review really. It comes with a 24 month warranty, or at least mine did when I bought it Nov 2010, and I'm thankful that Amazon have agreed to act as intermediary in the return, their usual excellent customer post-sales service. They are sending me a new replacement straight away, I'll simply post them back the faulty one and keep my fingers crossed the replacement lasts longer than another 14 months!