@paxmundi We have a Casper in our tiny Texas home (same model as Costco, but from a store that offered a free adjustable base with it.) We did not experience off-gassing like some have reported, but chose not to sleep on it and ventilate the house the first 2 nights "just in case".
We liked it so much that we bought a very similar one from the independent store baxk home because their package price was cheaper than Costco Casper plus adjustable base (we would have to by elsewhere as our Costco didn't offer one.) Again, no noticeable outgassing - and I am sensitive to it.