This is absolutely the best bed I have ever owned. At 52 years old I have suffered from lower back pain and neck pain for years. I tried various “mail order” beds with always the same result. I felt like I was sleeping in a hammock that over time just got worse. I started looking at air mattresses and of course the one that came to mind was the one that had the “best” marketing – or should I say the most visible marketing – so we went to the store, subjected ourselves to their “scientific” selling, laid down in the bed and thought wow this is a great idea – but then I asked one simple question. If I want the lower back firmer to support my lumbar but want the head and hips more soft how do I do that? The salesperson had a complete and total dumbfounded look on her face. I realized that this “smart” bed was actually about as dumb as the other beds I had tried – with only one air chamber per side there is physically no way you can have a firm lumbar with soft hips, legs and head – it was clear that I was headed for another “hammock” experience albeit a very, very expensive one this time around. So we left feeling quite dismayed. How is it possible that no one had developed a bed with multiple air chambers to support the various parts of the human body at the same time? On the internet I go and low and behold I find ReST! The fact that I now have multiple air chambers on each side of the bed, controlled dynamically by the position of my body has literally cured my back pain. I sleep like a baby, wake up rested and ready to go. And the best part is that my wife has her own, totally different settings – each adjusting automatically as we sleep – it’s amazing! We got the split king with an adjustable bed frame and I have to say it’s a match made in heaven. Bottom line? The ReST is not the cheapest mattress by any stretch – so if cheap is your mission this might not be for you – but if AMAZING performance, pain relief, quality and comfort coupled with great technology and customer service is your mission look no further. ReST is the standard in air mattresses as far as we are concerned. They have absolutely raised the bar. That other “smart bed” – not too smart if you ask me! I only wished I found ReST sooner!