Sorry to break up all the Stephen Hawking post (RIP), but I'd like some advice on this topic. Been thinking about diving into the foam mattresses but do not know a whole lot and any research I've done on them I can't take it face value has a lot of them are testimonials from the manufacturers. 1.My question is how comfortable are they? 2.How long do they retain their shape (ie; will there be a adult man sized divit imprinted in the mattress after a few months use? 3.Are the full mattresses firm at all or will I sink in as if I was in the foam pit at skyzone lol? (I prefer a firmer mattress, but not against some give). 4. What are some recommendations for those of you who do own/use a foam mattress. The ones that come to my mind are the ones advertised on some of the podcast I've listened to such as Casper, Leesa, and Purple mattress. I'm not against dropping 500-1000$ on a matress if I know it'll last me a good long while and be comfortable for myself and the occasional lady that would be spending a night or two. Though if there are cheaper options available that are good quality, I'm open to those as well. Any advice or guidance would be much appreciated.