Contrary to what most people think - Chicago pizza's are not all deep dish pies! I like the occasional deep dish but mainly prefer the thin crust that I grew up with.
When I moved to greater Chicagoland, Rosati's was my most frequently ordered, as it was very close to my favorite small-town pizza joint. This place is true to its roots.
Rosati's has great pizza and if you visit the store, the staff treats you very well as others have noted. The Big Cheef is an incredible Italian beef that I get when I'm really hungry. I recommend adding tomatoes, sweet peppers and some sauce! My wife and daughter love the lasagna.
You won't be able to get one of those $10 pies the chains are battling over but the pizza from Rosati's will blow those guys away any day.