Because my partner and i have seperate sleep numbers at the opposite sdes of the scale, it felt like if I rolloed over i was climing a mountain.  likewise, i felt at any time, my partner would slide off the mountain and squish me.  Now if we had a comparable level then it would have been fine.  I do think that it was the most comfortable mattress i have ever been on and would have kept it if it weren't for the mountain issue.  I have heard that this could be remedied by putting some foam at the base of the lower side (under the air chamber) but i didn't try that so I can't speak to that.