I purchased this mattress for my son, and he says the mattress is very comfortable,,,I also think the mattress is very comfortable, although I have only laid in in for short periods of time. But the whole buying process was a great experience, and for that I rated this mattress a 9. I may be purchasing another one in the near future.
While the comfort is superb, the off gassing and unnatural materials used in this mattress make me uneasy to spend so much time lying on and breathing in. If this were made from latex or other natural materials I would give it a 10+!!