I think our only complaint was that it was a tiny bit small for our bed frame that we already had. Otherwise, been sleeping pretty well for the past 2 months. We tested several other mattresses in person, did a bunch of online comparisons, and decided to try out the helix one. I used to turn like a rotisserie chicken, but that has stopped. I started dreaming regularly again, presumably because I was actually asleep and still long enough to do so. Not waking up in pain every morning is nice. We are hoping that his back won't go out as often, if ever, but it's only been 2 months so we'll have to see. But so far so good. The box it came in smelled pretty strongly bad, but the mattress itself did not have an odor, we were concerned that we might have to let it air out for a day or two, but it was good to go after it completely decompressed from the packaging. We still have about another month before the trial period is up, but it doesn't seem like we'll be returning this.