I tried 2 medium-firm memory foam mattresses before I decided what I really needed was a firm memory foam mattress.  I have some upper back problems, so this bed helps support my back at night especially because I'm a back sleeper.  I've had it for a couple days now and it's definitely better than the medium-firm mattresses, but I noticed that it's still a bit uneven after deflation.  Perhaps this issue will resolve over time, not sure.  Overall I love this mattress, but I'm still not sure how much memory foam is in it.  It feels like it's just a very thin layer at the top (like a mattress topper), but I do appreciate the extra support of the coils inside.