I've been once. I ate at Pat's, mainly because the group I was in bum rushed Geno's, so I just went where the line was shorter.
It was good. It was expensive. I think you paid a lot for the privilege of saying you ate there. I'd eat there again today. If I never make it back, don't think I'll be out much.
Others in our group got cheesesteaks off street carts, and from what they said, theirs was just as good and about half the price.
I've got a friend from Philly that swears by somewhere else not too far away from the two landmark joints, but I can't think of the name.