We are about 1month in with our new mattress, I cannot find one thing negative about it. The Helix replaced our sleep # My husband previously had back surgery years ago. Lately he had been noticing his back was really been bothering him when waking up ( not typically the norm). He felt immediate improvement after sleeping on the Helix after the first night. It took me a bit longer to adjust, that said, I realized I was getting into more of a deeper sleep not tossing and turning. I have really become attached to our Helix. Regret not getting it sooner and wish we would have got one for our vacation rental. :sleeping::zzz::zzz: