I actually like this place better than Ian's for a late-night pizza on or near State Street. It's your more classic New York-style, greasy pizza that comes in huge slices. It's not as crowded as Ian's, so you'll actually get to sit down, and the pizza is good if you enjoy the NY-style.
I've actually come here occasionally when it wasn't after midnight. I came here once for a post-5K carb reload (so delicious and greasy! just what my body needed!) and also on the way home from an evening out elsewhere.
It's your great classic pizza place, and one of the things I miss about not being in Madison!