I just replaced my sleep number purchased 15 years ago with a P6. In between, I tried an airbed by boyd (horrible), lessa, which created a moon hole after about 6 months, and Brooklyn bedding which lasted longer but also got the moon hole after 10 months. I now have a P6 sleep number and sleep so much better. I took me awhile to find my number as my shoulders are a mess and I sleep on my side. My vote is for the sleep number. I also have an adjustable frame. You can find them a lot cheaper and just as good from other than sleep number after all they are manufactured by Leggett and Platt.