It works well, usually air forward square knocks the enemy a bit back, but against a wall you stay right on top of them, by the time they recover from the stagger they're killed by your super, works on everyone but Sly.
I use another way : I throw the opponent in the air with up square and give a bow shot with right/left triangle,after this i use the special,in big part of cases this is a kill confirm.
Anywho, I've been hearing a rumor of people still killing people who tech down. If they're anything like me, they crouch a bit after teching down. I did some experimenting, and Big Daddy, Sweet Tooth, and surprisingly Drake are still big enough to be killed while crouching.
Fresh to death