Initially our Memory Foam 10-inch Mattress (Queen) we purchased here from Overstock seemed great. I suffer from lower back pain, and like other reviewers, I initially found the mattress to be the most comfortable surface I have ever slept on. Not only that, incredible as it may sound, my back pain disappeared after my first night's sleep! If I was writing this review in the first week, I would have to give it a glowing 5-star review, even with the slow 10 days it took to deliver the mattress to my house. However, after sleeping on this mattress for one month, my wife and I could tell permanent indentations (or "wells," as my wife calls them) were forming where we sleep. This makes the mattress much less comfortable as it does not provide the same support it did when it was brand new. After 2 months, this mattress sags almost as bad as the 11-year-old inner spring mattress this replaced. I weigh 195 lbs and my wife is 140; we are not overweight as we are both tall. The quality of this mattress appears to be poor. I guess one clue should have been the short 5-year warranty. And no warranty papers even came with the mattress, so I have no idea who to contact regarding the warranty. The only reason I give this two stars instead of one is because of the incredibly low price. For a spare bedroom that is rarely used, this mattress would probably work fine. For a bed that is used every night, I would recommend a better quality mattress. At first I was as excited as other reviewers, but I have found the old saying to be true ... "you get what you pay for."