I ruptured two discs in my lower back three years ago and I tried physical therapy, a new chair, and a stand-up desk to alleviate the pain. I realized my bed was a big part of the problem and I had in-home 90-day trial of several different manufacturers (Casper, Purple, Tuft and Needle, Saatva, Tempurpedic) but none helped. Firm beds made my shoulder fall asleep. Medium firm beds did not give enough support to my hips. Being able to set the firmness in each zone with the ReST has been a game changer. My only complaint is the App still needs a lot of work. It just lacks a bunch of features I would hope for (memorize several positions, more sensitive controls, a number rating for pressure, etc.) plus it can’t connect through my router. The customer service has been great and they assure me they are working on improving the app.