[laryb]

We have had both. I have had 2 back surgeries, several ruptured discs since my early twenties, and now have arachnoiditis, so the right mattress is very important to me.Have tried firm, soft, every type of water mattress, Select Comfort, and Tempurpedic. The Select Comfort and Tempurpedics have worked best for me, with the Tempurpedic being the one we brought down with us when we moved down full time. While the sleep number was very comfortable (we had the model with massage and adjustable head and feet), it did let you feel pressure points, while the Temp. doesn't. The downside to it is that it does get warm. We just keep the fan on when we sleep. Try them both and you can't go wrong with either. Saw a mattress at Showcase Direct that they told me was memory foam and was cooler than Temp., might want to check that one out.