We looked at mattresses and bought 3.... all of which ended up being donated and finally after a lot of research and more money spent then I wanted to spend we bought a Nectar. It was rated #2 in all the research I did. I think the Casper was number one at more than twice the money. I don't know what size you are looking for but we bought 2 singles from Nectar and a frame from Amazon to make it a King size and absolutely LOVE it. Here is the website for the mattress
https://www.nectarsleep.com/mattress and here is the frame we bought... Zinus 9 Inch High Profile Smart Box Spring / Mattress Foundation / Strong Steel structure / Easy assembly required, King . It is very nice because if one of us gets up in the middle of the night we don't disturb the other one. Just my opinion and hope this helps you.
Sally