We bought our Pranasleep mattress and about a year in, we were sleeping in big divots. Both of our backs were killing us. Even with rotating the mattress, it was horrible. Finally gave in thinking the mattress was older than it was. Shocked to find out it was barely three years old. It has huge deep sleep trenches, lumpy and sagging everywhere. City Mattress said they "might" credit us as the (according to the salesman) mattress has a known issue of failing in a short time. Of course, they would only upgrade us. And then they were not going to give us any credit because there is a stain on the mattress. (Warranty is voided if there is ANY stains)
I cannot warn consumers enough to look at reviews and be careful. AND do not use City Mattress...big con artists. We did buy another mattress elsewhere,

This mattress I was told by City Mattress was the rolls royce of mattresses. I needed to get a Dr. note about my back problems to get no tax, they refunded the tax. I have very bad back issues.
Haven't had a good night's sleep since I bought it. Though my back was getting worse but from reading the reviews I am thinking not. Buy a new car not this mattress. And don't trust the sales staff telling you that this is the best there is.

It took 73 years to find this Godsend.

never slept better in my life