I have eaten at Uno's and its sister store down the street, Duo's, many, many times. This is Chicago pizza at its finest. Try the large Uno's with garlic and you will be in pizza heaven. Both locations serve the same quality food and both get packed, so unless you go during an off-hour be prepared to wait for a table. You place your pizza order when you leave your name at the hostess stand, so that speeds it up a little bit but, as the Roadfood.com reviewer said, it takes a good while to actually cook the pie so don't be surprised if it takes an additional 45 minutes once you sit down at your table.
The only negative I have about it is that the tables and booths are very small and they pack you in like a sardine. The waitstaff has also been known to be less then attentive but I will put up with anything for this pizza. It's that good!
"This is a single individual pizza. You don't see the sausage, which is spread in abundance under the thick tomato topping. In our opinion, it's the rich, crumbly crust that puts this one in a league of its own."
"Until you've eaten at the first Uno, you cannot know the true glory of Chicago deep-dish pizza. Uno franchises around the country are mere shadows of the original."
"In the history of pizza in America, this corner bar is a landmark: home of thick-crust pies ... and the beginning of Chicago's rich pizza culture."