I purchased a King Koil Sleep Design 1000 Firm mattress that was manufactured by Blue Bell Mfg. in Connecticut. I've had crippling back and shoulder pain and have gone back to the store where I purchased it who said that it was just "my body adjusting to the new mattress and to give it time." I'm not 10 years old, so I've had a few mattresses in my lifetime and have NEVER had this happen before. It's so bad that I dread going to bed at night knowing how much pain I'll feel in the morning. Before I go back to the store again, anyone out there have this type of problem with this? It's a urethane foam material - one of those "non-flip" mattresses. BTW, also found out that King Koil discontinued this model...hmmm. wonder why? Anyone? Thanks!