good if it lasts [SEP] The brush worked great for the first two months. I was surprised at how long the batteries lasted. The rechargeable ones went at least a month before needing charging. When I took out the batteries for charging this time, there was water in the battery compartment and rusting. I recharged batteries, dried out unit and put in batteries and the brush wont work no more. I have used the rehargeable versions for years without problems but this purchase was a mistake.<br /><br />Update Dec 1, 2013: spoke with customer service and they are sending a replacement unit. Very easy process. I will update to three starts for excellent customer service. Will give the new unit a try and update review again.