Review (5/5): Great item!
UPDATE: Wow! I've had this for 5 years now. Still running like a champ.
The gasket in the battery door can be problematic. Toothpaste reside builds up over time and keeps it from staying in place. When this happens, I've cleaned it out gently with a Q-tip. Once all the residue is removed, it's good to go again.
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After thinking about buying one of these to replace my normal toothbrush I bit at this one because of its lower price. There really is a noticeable difference! My teeth feel smoother and cleaner after brushing than with my old brush.
I have not had any problems with water intrusion, but I've been careful about not soaking the thing. I've also only had it about a month.
Overall I'm very happy with the product and would buy it again.