As an Italian, I am biased when it comes to Italian eateries and shops. However this place blows all other shops out of the water. If you don't buy anything else make sure you get a Godmother. It's their most popular sub, and comes with salami, mortadella, cappacola, ham, prosciutto, provolone, cheese, and a ton of toppings (called The Works). It's all on a crispy Italian loaf that is made to perfection.
Other than that they can have the most extensive Italian grocery filled with items that you can usually only find in Italy. These are essential to cooking a real, Italian, authentic dish.
Beware parking is limited!