When I first saw the size of a slice of pizza at Benny Fiero's, I assumed it was just a gimmick and the pizza wouldn't be very good. Boy was I wrong! The pizza is thin until you get to the end of your slice and that's when you start to get full. Eating more than 1.5-2 slides would be impressive.
I ordered delivery from BF's once and the pizza box was so large that I had to angle it to get it to fit through my front door! For $30-35 you can feed 4-6 people which isn't too bad and it's fun to eat such an enormous slice. I did the math - one slice at BF is like 3 slices of XL pizza elsewhere, but keep in mind it is effectively thin crust pizza.