After a few nights of adaptation to the new mattress (we slept on the floor four night before that) we can say one thing: WE LOVE IT!
This mattress is a really great one, and everything feels so much better. The sides are reinforced to hold you when you sit on them, and the center of the mattress is soft and firm at the same time, and you really don't feel anything when your +1 is moving beside you.
We recommand!