I bought this online, after having tried the Homedic massage cushions for the chairs. Those were brillant (me and my bofriend spent 20 minutes trying them out in store) and gave you quite a deep massage. I thought the mattress would be similar and allow you to lie down as well - added comfort! The price difference should have told me something... this version only provides a vibration, no moving spheres massaging your muscles. It hardly makes a difference, it is NOT a massage, just literally a not-so-strong vibration - if you are going to buy someting for aching muscles or just for a relaxing session, I reccomend you invest in one of the more expensive cushions (we bought one eventually, worth every penny).