I’m going to be honest, I was pretty skeptical to buy this couch because of the reviews saying it would tip over and that it’s like sitting on a rock. Yes, this couch is firm, but since I’ve been sitting on it daily and lounging around on it the firmness is slowly dissipating.  About the couch falling backwards, if you don’t put the upper portion on correctly then yes, it will tip. My partner and I had to really push down to get it to slide all the way down. As a futon it’s not comfortable, but I got a mattress pad and and cover to add some softness and thickness to it. That’s made a world of 
difference. Overall really like this purchase and I’m very glad I bought it!