Work fine for me..
I am not sure how other reviewers used this, but I had no problem after 2 years. To be fair, I primarily used the toothbrush only on trips (I had another rechargeable at home), but my usually lasted a week at a time and I make these trips at least everyother week. Oh, I also brushed at least twice a day.I agree that the bottom cap and o-ring are not exactly the best, but I have no problem with water coming in. After brushing, I rinsed the whole thing and left it stand vertically. I am on my 3rd set of batteries now. For me, it was a $25 well spent. I like it because I can get battery for it anywhere. I would buy another when this one dies someday. The only thing this toothbrush needs is pausing every 30 seconds like its other models.11/16/09:3 months since my last review, my tooth brush died. I immediately ordered another one, same model. It came in orange color now and worked just as expected. I expect to use this for another 2 years at least.