How does the peanut gallery feel about Sleep Number beds? What about Purple and others of its ilk? I have never tried any of these, but I am evaluating new mattresses and don't want to spend money on something massively overpriced.
About the Purple mattress I will say: it is very heavy and difficult to move. And that grid stuff will last roughly forever. The only other non-personalized advice I would give about it is to feel an actual mattress, not a sample and not a pillow. The effect of the grid feels different when it's mattress-sized and with all the other layers, so the effect might not be what you're expecting if your only experience is a pillow or sample.