I used this stuff this summer to replace the far to soft foam I originally had in mine.
Sleep time
I used the the 5 inch stuff. This is pretty hard stuff and if I was to do it again maybe go with 3 inch of it and an inch or 2 of something softer.
I weigh almost 300 lbs

And I can set on it and not sink all the way into it. But I made a riser for the upper 1/3 to make it at an angle and it sleeps a whole lot better than the original foam. Well the bottom 1/3 is still the crap foam, my legs don't know the difference. I made a 9 night trip this summer and slept pretty good on it.
This place does have other foams, my next one i will try a 2 layer like I discussed with the next softer foam. I sure would like to get some samples to know a bit more. Or get together with people who have different kinds of foam.
Randy