Top positive review
Brilliant toothbrush. Here's some lore you may find helpful.
on 11 October 2014
The Philips Sonicare range are fine toothbrushes and very effective cleaners. I'd never buy anything else. Manual brushing is useless by comparison.
That's the review. Now let me share some useful lore with you...
I've just replaced my HX6902/02 after 40 months. The gasket through which the drive shaft emerges had perished and a little water had been seeping inside. Limescale had deposited onto the electromagnets' polepieces and onto the permanent magnet facing them at the end of the transmission assembly. This had forced the assembly out of alignment. The result was a very noisy machine and a much-reduced cleaning action. The battery was still full of beans, incidentally.
The warranty runs for two years, during which time Philips will replace the unit. After that they'll give you a discount voucher for their online shop. It's far cheaper to buy a new Sonicare from Amazon.
Installing a new AA-size Li-Ion battery is tricky but feasible. That's about all you can do, since the design is not capable of being fully dismantled for mechanical repairs. Incidentally, the transmission shaft in my HX6902/02 was a tough metal stamping with a vee cross-section, and it looked impervious to fatigue fracture.
Finally, a word on Flexcare. This feature provides a repertoire of alternative brushing and massage programmes. You pay a lot more for such features, and I don't think they are useful. I have bought a HX6511/50 this time. It has the same brilliant cleaning action, takes the same ProResults heads (among several other types), omits Flexcare, and costs less than half the price.
So once the machine is out of warranty, if trouble strikes, don't waste your time trying to mend it. Bin it and buy a new one right away.
Great toothbrushes. I recommend them highly.