Hands down the best crust and sauce of any pizza in Madison, and as a true pizza lover will tell you, it is the crust, and then sauce, that are by far the two most important things in a pizza. Any pizza place can have good toppings. Most pizza places do not have sauce or crust that is any good.
The only downside to Ian's is the half-witted drunk frat boys and sorority girls that frequent this place. Often too drunk to even stand up. You'll definately want to get your order to go, or even better have it delivered.