I think the reality is there is a lot of myths and stories thrown all over the internet about mattresses. It's probably one of the most difficult purchases to make objectively due to the layers of BS and paid reviews everywhere. JR's own website is filled with this kind of thing based on no scientific evidence, and I see it regurgitated in this thread but I'm not really buying it.
Yes cavemen lived on rocks with some leaves thrown on it - the average life expectancy was also in the 20s/30s, and physiology, diet, lifestyle were all substantially different to modern man so it's not really a good comparison for anything. So no I'm not going to lie on the floor for a week
. A better comparison may be most Asian cultures with futons on the ground, and I can buy that, however the average westerner is also much heavier and taller than the average Asian. I also can no longer full squat for hours on end like traditional cultures - I'm a fat ass who sits on a computer all day for work.
Really, the issue I have now is just that my prior mattress is worn - at least the top layers are worn out, and my hips, etc are just digging into the springs I think. So a new mattress, maybe a bit less firm, should be good. Not gonna spend a fortune either on it I don't see the point as my prior one lasted nearly 7 years for 500. I also think the margin is insane on these - I can't imagine the JR Artisan cost them more than 100-200 quid to make.
Given all the stores are shut now and I can't try anything out, and mattress in a box companies are all having BF sales I think I may give it a go. It's still massively overpriced imo - 400 quid for a kingsize right now at emma, for example, for what probably costs 50-100 in materials, but I can always return it. I think Ikea might be a good place to try out when they reopen too.