Without a doubt the most comfortable bed we have owned. We replaced our SleepNumber i8 with the ReST performance mattress primarily to upgrade to a flexible base and learning of the multiple air chambers used in the ReST mattress. What we learned in the transition is that this is hands down the most comfortable bed we have owned. The self adjusting multiple air mattresses really makes a difference in the comfort of the bed compared to our prior air mattress. We absolutely love the bed!