I bought the same mattress back in February. The tag showed it was in the box for over 4 months, which concerned me. And two of the corners were slow to fully inflate. But I gave it a couple weeks and have been mostly satisfied. A little more plush than medium firm, but I do enjoy the zoned support. Maybe not the greatest edge support. But sleeps cool and comfy. Hopefully it holds up long term. But don’t have to worry too much with Costco’s return policy. More on reddit.com

I’m skeptical on a memory foam mattress actually being cool and breathable, I have the regular one and I sweat a lot More on reddit.com

The highest quality Costco mattresses imo, for a memory foam mattress the Tempur Supreme, for a hybrid the Tempur Supreme Hybrid, and for latex the Avocado Organic. Im guessing if the regular Tempur Adapt was too expensive however both of those might be a bit out of your price range as well, but they are probably the nicest mattresses Costco carries. Costco is running a $300 Costco gift card with purchase, so that brings the cost down to $1600 at least which is pretty decent(assuming you end up spending $300 at Costco eventually anyways). Between the two you are suggesting maybe Id give a slight edge to the Casper, but I wouldnt be especially excited about either. If you have laid down on either one of them before and know that they match your comfort preferences, there would be your answer right there though. Costco's return policy kind of takes away the stress over durability so you can really focus more on comfort, but comfort is subjective so there is no way for me to tell you which of the two will be more comfortable for you. More on reddit.com

I think the best way to rule out mattresses is to see what’s for sale use the most. I see a lot of Casper and nectar More on reddit.com