This mattress is so comfortable, but a few things really bother me. First of all, none of my sheets fit. I bought new sheets for deep mattresses, but they are tight too. The mattress is over sized. It hangs over my box spring on all four sides, and the corners are rounded, not squared off. It is already sinking in the middle. I sleep alone and I only weigh 150 lbs. so I wasn't expecting this. I don't see how this could last for 20 years.