We have a Serta double pillow top. I love laying on it so much that I have to kick my own lazy ass outta bed everymorning. I then have to hurry up and make the bed so I'm not tempted to get back in It's 10 years old now and still going strong (just remember to flip and rotate it every month and it'll last a LONG LONG time.
We bought a Sleep Number bed a little over a year ago and I LOVE it. I've read poor reviews on this site about Sleep Numbers and my experience is so different than what is stated that I can't believe they are reviewing the same type of bed! It does NOT feel like a glorified air mattress. We have a set that has additional padding and memory foam over that so maybe that is the difference? I have never slept better in my life and it has been completely worth the $$$. Even better, I need a firmer mattress when I was pregnant last year and all I had to do was adjust the bed to get it perfect to help me get comfy.