If you have tried one of these at your local dept store as I did [...] you hit the demo button and felt the back do it's thing and you also felt the seat motors kick in, vibrating and pulsating. Well guess what HoMedics has decided, due to cost and the ability to build more of them for the high demand and more profit, to delete the seat motors. The problem is they kept the same Model # SBM-200 and the same price!So if you want the original that does it all you better call around and make sure you get one of the older models with the hand control that has a body silouette on it with controls for the seat motors. The new model has only 4 buttons and no seat motors.Don't get me wrong I love my older model SBM-200 for its stimulating massages, that's after I returned one of the new models that did nothing but go up and down the back. The seat vibrating function adds alot to it!!!