I've been greasing baking pans with cooking spray for some time, but since using the Bake Easy spray I have hardly had trouble getting anything out of the baking pan. Most of the time it's just a matter of running a knife along the edges of the cake/brownie to loosen the edges then inverting the pan with a shake or sharp tap to get my yummy creation out.
It is not expensive and I highly recommend it for anyone who bakes more than just occasionally.
I even use it for yorkshire puddings these days. I know that purists will be cursing at me now for using baking spray for yorkshire puddings, but my yorkies are as good as they've always been and I haven't received any complaints from my British husband. Hey, why knock it if it works?!