Terrible!!
I first used the rechargable battery Sonicare toothbrush.  After a few months, the darned thing would just stop working, or the vibration of the toothbrush became too weak and didn't work properly.  I bought another one, same thing happened after a few months.  Because they are expensive and can't fix it.. or change the battery, I decided to buy the replaceable battery one.  I had to throw the rechargable ones out, at $100.00 a pop.  I figured that Sonicare Xtreme would be easier, and cheaper, and you can always replace the batteries.  I read the reviews here first, and made sure to wipe it down after each use and lay it on the side, so water doesn't trickle down to the batteries. I would also clean the inside of where the brush was attached and other parts.  I never noticed any water inside.  The batteries didn't last long, maybe 2 weeks tops, using Duracell.  I can accept that, even though it was a pain.  Opening the bottom piece was ridiculous.. had to pry it open using a nail file, to replace them.  Then, after two or three months, the toothbrush stopped working altogether, even when putting in new batteries.  Had to throw it out.  I got another one, and basically the same thing happened.  Many times, I would tap the bottom on a hard surface to jostle the batteries.  Sometimes that worked and was able to finish brushing my teeth.  Then the second one became too weak to work properly after trying everything .  Onto the third one.  This one is worse.  I got it last week (didn't buy through Amazon, another site) and after putting in new batteries when I got it, it would work for a few seconds...then stop.  I pushed the button a few times, the toothbrush just died.  Tried everything again, tapping it a little, made sure the brush was screwed on tight and the bottom piece was on tight.  It work long enough to brush my upper teeth, then died again.  At this point, I've had enough of the poor quality of these expensive pieces of *cr..* and vowed never to buy this product again!  It cleans my teeth great when it works, IF it works.  I don't recommend these toothbrushes to anyone.  Too expensive all around for an unreliable product.
Rating: 1 stars