This one doesn't provide the same support in the hip/back area - it looks normal and goes back to its regular shape, but it has just gone soft in the middle on either side.
I looked through the reviews and I see a reviewer who said the core of this mattress is 'regular' foam, enclosed with a few inches of memory stuff all around. Can't say for sure.
For prospective buyers switching from a conventional mattress, just be aware it's a big difference. It seems firm when you first lay down, then it settles. I kind of had to learn to make the mattress conform to me when I get in.
Rolling over or leaving the bed takes more effort (you're kind of stuck in the 'hole' you've made).
Oh, and because of the way the material changes shape with pressure, you might find yourself off balance during activities. There's no bounce, either.
YMMV