Bests & Worsts Reviews from Amazon

I am a dental professional, and have been using Sonicare brushes since 1992. This is the older (2nd gen) model, it is more durable than the more recent models. The handle is much thicker (and heavier) than the newer models, and the brush heads screw on (newer models just pop on). This may be a significant demerit for some users, but I have no trouble with it and again, it will last for many years. The only thing that can really kill it is the battery getting too old. Mechanically, there are no internal moving parts in this unit (other than the on/off button), the moving part being within the brush head itself, and thus it's renewed with each brush replacement. On the newer models, the mechanical parts are internal, and they can't be replaced. Hence, the newer, more expensive models will not last as long. A relative of mine only uses the newer ones, as they are for her more maneuverable. They last about 2 years.