CasperPromising review: "From day one, I was skeptical. But a good friend recommended Casper. My wife and I discussed it and decided to give it another chance. With 100 days to test it, there was very little to lose. We opened the box and left it open for 24 hours. It was quite an experience to open the box and cut the wrapping. The Casper replaced our old mattress and we kept the original box spring. It was soft, firm, cool, and hugged me night one. The edge was firmer than a regular mattress but it wasn't hard to get on. Night two was a revelation. I realized that I was sleeping on the edge my mattress, and that it wasn't doing me any good. Casper made my bed more aligned and it was a great decision. It was an excellent mattress that we both agreed on after a week. After about a month, we decided to keep the Casper and tossed our old mattress. The Casper has been with me for over a year and I wouldn't trade it for anything. If I was paid a million dollars, the mattress would be mine, but I would also buy another mattress and keep the rest. The mattress is perfect for me as I can get out of bed with no pain. My old mattress took me up to 20 minutes to get up from my bed. The Casper is so comfortable that I can get out of bed without pain. It's the best part about my day. David LopshireCasper has it for $506+ (originally $595+) and is available in Twin or Cal King.