The first year took a bit to get used to. It's as comfortable as sleeping in zero gravity for me ... but the night sweats the first year were unreal. SOAKING sweat .... as in I had to get out of bed & towel off! They said in the manual that this may happen the first few days .... yeah, try a solid year!
The other thing that sucks about it is you can't flip it over. You have to turn it 180° every 6 months, as it starts to form a divit. The top is like a feather pillow material, so you can't flip it upside-down. But for us, the fact that it can be folded in half allowed us to get a queen size upstairs ... otherwise, you can only fit a twin ... MAYBE a full, with a running start.