well this is an interesting mattress. after having it for a couple of months the middle of the mattress seems to have a ridge or the edges seem to be dropping. many times it feels like you are going to roll off the edge of the mattress. should have heeded the review about the ridge or high spot in the middle of the bed. make the bed very uncomfortable if you sleep on the edge of the mattress. forget sharing with someone as the best sleep may be in the middle of the bed.