Well, it's not THAT good, but it is right up there with the most comfortable memory foam mattress I've ever owned.
I have quite a few pain issues and this mattress helps alleviate them. In tandem with my shoulder supporting memory foam neck/head pillow and my memory foam bolster, I experience a great deal less pain when I sleep at night. The gist being that I don't wake up in as much pain as I did previously. I also don't wake up as often.
Thus far this mattress has been cooling too. I live in Texas and, although it's not overly hot or humid yet, I'm sure this mattress will continue to help cool my body as a sleep. Originally I paired it with a non-latex mattress protector that supposedly "breathed," but that was a mistake. I woke up sweaty on more than one occasion and removed it. This mattress has a nice cover and that will suffice as my mattress protector.
BOTTOM LINE: I can't recommend this memory foam mattress enough. In many ways, it's changed my pain profile and thus my life for the better.