I have had two back surgeries and could never sleep more than 5 or 6 hours on my old mattress.  My back would just ache.  After buying three different mattresses over a ten year period, we bought a select comfort  mattress.  I can now sleep 8 to ten hours without any pain. The dual controls make it possible for me to have a very firm mattress and for my husband to have his a little softer.  The mattress doesn't weigh a lot so its very easy to change the sheets.  I have a pedestal bed so I didn't need a box spring. If a part of your mattress breaks down, you can just replace that part. I...