Hey Mvermeer, if you do some searches, you will find a lot of people that had the ripped seams problem. Mine was one of them. Fortunately, my boat was still under warranty and all were replaced by Dorge. If your boat is one of the few still on warranty, might want to look into it... if you do get them rebuilt, have them put heavier-duty foam in there to make the seats not as plush.
Oh, and enforce a "don't step on the back seat" policy. It helps.