We bought a Purple and gave up on it after three nights. The foam portion of the mattress compresses a lot and the purple grid on top has this weird property where it holds weight up to a point and then collapses completely after that point - there's no progressive compression property in that grid. Those two aspects of the foam + grid amplify one another to result in something that has deep valleys where you have your most weighted points of contact (for example hips and shoulders for a side sleeper) and peaks where you don't. For me this meant that my legs would be coming at an uncomfortable angle out of the hip valley placing weird stress on my knees and my core/torso would similarly be forced into a weird curve over the peak between hips and shoulders. I woke up every day feeling like I'd been mildly beaten up and my wife compared it to a torture device - she has never experienced back or neck pain in her whole life but three nights on the Purple were close to debilitating for her.

The telling aspect of their marketing/FAQ is they actually tell you to expect this: they claim that years of sleeping on poor mattresses has conditioned your body to the wrong position and so it will be painful for 1-2 weeks while it corrects to their one true mattress. This seems like a load of bs. I've slept on hundreds of mattresses across the spectrum, from quarter inch closed-cell foam pads on top of rocks/roots to various hotel luxury mattresses and everything in between - and never experienced this level of painful need to "get used to a good mattress".