Review (3/5): 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.
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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).