My previous bed was also a Serta Perfect Sleeper and I slept on it about 10 years. This time I bought another Perfect Sleeper but got an adjustable base. This is the most comfortable bed I've ever slept on! It feels like I'm laying on a cloud! Having an adjustable base has made all the difference also because of certain health conditions I have. Zero gravity is the most comfortable...I look forward to going to bed now!