Doesn't work if left in cold and humid bathroom - Updated! Now it's broken!
Updated December 10, 2011.  After having the trouble mentioned below for a brief period, now the brush doesn't work at all.  Brush did not last long (~3 months).  Disappointing reliability.  Buyer beware.<br /><br />____<br /><br />I've used the toothbrush for a couple of months now.  I'm basically happy with the toothbrush and the replaceable batteries are definitely a step in the right direction.  My toothbrush stopped working (just one short buzz each time I press the button) and I eventually figured out that if I keep the toothbrush outside of my cold and humid bathroom then the toothbrush works normally again (so far).  I guess that condensation inside the toothbrush prevents normal functioning of the toothbrush; once the condensation evaporates then the toothbrush works again (for now).  The problem I have is definitely not just low batteries (the toothbrush has the same problem with new batteries).
Rating: 3 stars