Tried to contact manufacturer when it wouldnt start up.  Left message and never got a return call.  I traced it down to an unpluged wire, which I had to remove a support bracket in order to get my hand in where I could plug it back in.  After that it worked just fine.  Works great for one person.  With two you have to sit sidesaddle and put your legs in the adjoining empty seat or cross your legs over or under the second person. With three you would have to sit with your knees to your chin. With fourIs sure it would overflow and feel like seeing how many people you can crowd into a phone booth.  We are happy with it for two.