We purchased the King size Rhapsody model in Oct 2008 and have waited and waited for it to get more comfortable! Purchasing it in the beginning of winter was the biggest mistake! Our master bedroom generally runs cooler thant the rest of the house, so we thought it was the temperture during the winter that was making the bed so rock hard. By the time summer came along, it was impossible to sleep on it directly because of the heat, so I had to sleep on a thick comforter to avoid the heat retention. I did not have back or shoulder pains before I purchased the mattress, but now have acquired them! It seems if I don't sleep too, much in it, my back and shoulder is better! So over sleeping causing more back and shoulder pains! This was the biggest mistake we have made and regrettably expensive, too! I would not purhase this mattress! In fact, is any interested in purchasing it?