Hi bobmarley,
You can see the criteria I use for memory foams in post #10 here and this mattress certainly doesn’t meet them.
These are low quality to medium quality memory foams and I personally wouldn’t consider a mattress that had 2" of 3 lb memory foam in it. In addition to that … “working on CertiPur” and being CertiPur certified are two different things and I personally wouldn’t buy any offshore memory foam that wasn’t certified.
You can see some of my thoughts about Sleep Science in post #2 here as well (although my comments there about good quality foam doesn’t apply to this mattress)
And finally you can see some of my thoughts about buying a mattress from Costco in post #4 here.
Overall … the only benefit of buying this mattress that I can see is Costco’s return policy so returning it is fairly painless (outside of the time and effort spent) but for me there would be too many strikes against it to consider it.
Phoenix