We've only had out mattress about two weeks, but we're enjoying it. I was having a lot of difficulty sleeping due mainly to get bounced around when my husband rolled over. That has been 90% eliminated.
I'm a side sleeper so this bed really hurts my shoulders, but my husband loves it. I guess if my friend likes a more firm bed, I'd definitely tell them about it. I did an insane amount of research and watched so many reviews on different beds but kept coming back to this one, I just wish it was a tad softer.