Well, compared to our previous incumbent, this is an absolute dream to sleep on. The initial "rock hard" status dissolves into a wonderful body shaped divot, to which is a double edge sword, as getting out of it can be a bit of a task!. Its solid, cool (find I sweat less - even in this oppressive heat) and extremely well built, so I personally have no complaints. The wife has one quirk, sitting the edge to place shoes on etc can be interesting, as it moulds to yer backside causing you to fall off, but this is as by design and not a problem really :-). Sleep wise, perfect, now we just need to silence the alarms outside, get shot of the cats and all the visual distractions in the bedroom and we'd be in slumber nicely. TIP, get the pillows of the same construction...pure heaven.