After about year of use, I noticed that the top cover of the mattress, mostly in the middle was coming loose from the material below it. This wasn't that big of a deal, it would just kind of bunch up a bit. However, after 1.5 years, I've discovered what seems to be a gap or tear in the pad just below the cover. It's about 2 feet long, and maybe a few inches wide, just about centered in the mattress running length-wise. It's very uncomfortable as it's right where I sleep. Unfortunately for me, I can't find my receipt so I'm not sure if it is covered under the warranty.