I'm sorry, but this doesn't hold a candle to Papa Del's. Can't understand the reviews that say otherwise. My guess is that people are tired of being mobbed by frat-douches and whoever else at Del's and want an alternative. So did I; this place did not deliver a suitable alternative.
I'm also from Chicago and used to Malnati's, Giordano's, Uno's, Geno's East, etc. The sauce here is SO bland. It was like eating crushed tomatoes out of a can. Reading the other reviews, it sounds like the sauce is inconsistent. Maybe if I went back ten times I'd eventually get a great pizza, but I've never had a bad deep dish from Del's. Not once in like 100 times.
The guy was friendly, and maybe they're cheaper (I don't really remember stuff like that) but I don't really care. What matters is how the pizza tastes. I can't ever see going to this place while Papa Del's is still in town. The difference in quality is considerable.