Awful. Extremely hard to push close (takes 2 able people pushing hard), and when you open it they shoot forward (I've hit a lot of people in the gut, hard... one time it flew out of my hand and ten feet out the door, and another time it shot open in the car and hit the back of someone's car seat and hurt them through the seat). I bought four  of these and have the same issues with all of them. And one of them won't stay open at all. How do these have so many good reviews?