After reading all the 5 star reviews, I felt confident that this mattress would be perfect. However, the first night I slept on it, I was a little concerned that it felt like there was a depression in the middle. One reviewer said to give it time. Well, it's been almost a month and it is just horrible. I try to sleep on the very edge of the bed, but even then, it is not possible to get a good night's sleep. It feels like you have to claw your way out of the bed in the morning. I try to put extra blankets in the middle to raise it up but even that doesn't work. Overstock was kind, but says that I must contact Simmons. There is a three page return form - it involves measuring the "depression", attaching photos and even then says that "Transportation, inspection, or removal costs of product" is excluded under the warranty. I've slept on air mattresses for 4 years, I cannot even tell you how much I was looking forward to a good night's sleep. This mattress definitely isn't it.