If you love NY style pizza, come to Pizza Sola.
It is the closest, by a LONG shot, to NY pizza. I've yet to find another Pittsburgh pizzeria that even comes close. Everytime I try one of the famous Pittsburgh pizzerias, I am disappointed. Maybe I'm biased because I'm originally from northern NJ and am used to NJ/NY style pizza, but in my opinion it's much better. Nothing bad to say about Pizza Sola. If you're for a quick bite of awesome pizza at a no frills, relaxed pizzeria, this is the place to go.
There was one review that complained about their margherita pizza and how there was barely any cheese... that's how margharita pizza is supposed to be done. If you want cheese, order a cheese pizza with toppings. Just throwing out some knowledge.