Interesting and timely that you would post this. Just two days ago I read an article from Consumer Reports, and here is a link to it.
We bought a mattress 3 years ago, and I wish I had read this before purchasing. Ours is “fine” but I think next time I’ll do more research than laying on one for five minutes. Apparently foam has come a long way, as have other types. This is such a pricey expenditure that one wants to be really satisfied with it.
Best Mattress for Your Size and Sleep Style - Consumer Reports