I've had other Serta mattresses in the past and this one is better than the others I had, which is hard to believe. I got this one with the adjustable base and it is so comfortable. I went with the pillow top soft because my back is bad and I was having a hard time sleeping on the old mattress (non Serta, 2 years old) I had. Since I got this one I have no problem falling asleep and staying asleep. The adjustable base has a "Zero G" setting that adjusts itself and is makes it even better. If you have a bad back, ot just want a great nights sleep you can't go wrong with the Perfect Sleeper series.