I lived in Chicago for 50 years and ate a lot of pizza in that time. Most people think that the deep dished or stuffed pizzas that became popular in the 70's are "Chicago style", but most pizza in Chicago is thin crust (not paper thin, but hearty), loaded with fresh ingredients (compared to NY style), and cut in squares (so you can eat 5 or 6 pieces). It is a meal not a snack.
Spinatos, a family owned and operated restaurant, is right on. All first generation Chicagoans, they get it right, even if a few of the hired help do not understand.
My only gripe is the Italian Beef sandwich, which was good, was more like a French Dip than a typical IB. They need to spice it up a bit.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.