Santa brought me a Sonicare this past Christmas.Didn't get around to trying it until a month later. Wish I'd got one years ago!Used with some clover compound (silica based toothpaste) really shined up my 50 year old choppers....But now it's May, and the brush only holds charge for five or six brushings, then it's dead.No idea what model since I didn't save the wrapper.Phillips is so proud of their product they didn't see fit to put a model number or any identification on it. It looks like the one in the Hx5351 picture but doesn't have all the cack pictured with it, other than the charger.Anyway, I'd have given it five stars a month ago. Now, with battery life that won't even last a long weekend, I can't see giving it any stars...