Kingsdown Body System Mattress Review

Let me start by telling you how sad we are to have a mattress that we love to sleep on turn out to be such garbage.  My husband and I purchased the Kingsdown Sleep to Live 400 green in april 09 and in the first month or so we noticed it was sagging on each side very much.  I will also mention that we are not big people by any means, so that could not have been a factor. The big name mattress retailer we purchased it from sent a rep out to measure the sags and found it was about 2 inches on each side with a huge hump in the middle.  We recieved a credit for a new mattress and we decided to go with the same one again since the problem was never the comfort level, it was the terrible sagging.  The rep they sent to us deemed the mattress a "manufacturer defect" so we were also thinking that the one we had was just a defected one and thought we'd give it another chance.  When they sent the new mattress we were told that we would have to pay a $90 delivery charge!  This was very upsetting because if we were given a defect this was in no way our fault  but the retailer placed the blame on the Kingsdown people saying they are the ones who are carging the fee. We had the new mattress delivered a month ago and right away, my husband was convinced we were sent a used mattress due to the large lumps that were already showing.  In the past month they only got worse, very dissapointing.  The rep came out again and she thought it looked terrible too.....she suggested we move on to another brand.  I would firmly suggest the same to anyone who mentions the name Kingsdown to me.  Today we picked out a Sealy Posturpedic...wish us luck!