My Aussie had knee surgery and needed to have this to get him back and forth to vet appointments.  He's 68 pounds so I couldn't keep lifting him in and out of my SUV - my back was not a fan of that.  He was hesitant with it at first, but once he realized how sturdy it was, he was more comfortable using it.  It is a great size for a medium to large dog and can hold a decent amount of weight.  It folds in half so storing it is easy.  You just have to watch your fingers with it because it would definitely hurt if you folded your fingers in there.  Other than being heavy to lift, it's great, but I guess that's necessary in order for it to be so sturdy. Overall very satisfied with this purchase.