I had been wanting a sleep number for years, my sister and her husband have one. I have fibromyalgia and every time I would spend the night with my sister, I would get the best sleep ever; completely sound, not waking up in the middle of the night. This is HUGE for fibro sufferers. The catch is, get the top of the line, which can run 5-6K. I hadn't been able to talk my husband into one, but my parents recently sold their house to live in a motorhome and gave me theirs. I absolutely could not live without it!!
Several of my friends (mostly doctors ironically) all have sleep numbers. I have 2 other friends that both had tempurpedic beds for about 10 years then got rid of them. They said the material eventually breaks down. They both have switched to sleep numbers. I know of at least 10 people that have sleep numbers and have never heard of a mold issue.
My husband, who could sleep on a rock, finally admitted that he really likes our sleep number, mostly because he never feels me move/turn over, and he likes his with a higher number than I do.
with that being said, free is free. I would have eventually saved up to buy my sleep number, but since it was given to me, that makes it all the better!! If you are being offered a free temperpedic, give it a try, and if you don't like it or the material breaks down, then go buy your sleep number!!