Firm but comfortable. Locking mechanism works fine so far. We really like that the legs that hold up the back of the couch in "bed mode" zip into the back and are hidden. We were placing this in the middle of the room and appreciated the back was also upholstered. As others have commented, the bed is a bit short, probably maximum height without hitting the arms is 5' 10", but with some pillows I don't think it's a big issue.