This is a fabulous hole-in-the-wall takeout-only place; Pittsburgh seems to mostly have sit-down places with a take-out sideline. But anyway.
We've been buying food here since just after they opened. I've never been disappointed. Zaw's does all the standard Chinese-American dishes, but better/fresher than other places (get the Tso Chicken to see what I mean). You must try the non-Chinese specialties such as the curried Singapore noodles; take the time to explore the menu, you will be rewarded.
I do mean it about the ""Chinese-American""; do not expect real Mainland food: also, be aware that this is a strictly stir/deep-fry and boil operation, not really the full range of Chinese cuisine.
Some people have mentioned that the place looks dirty.I agree it could certainly use more frequent steam-cleans, on the other hand I've never been sick from their food (unlike some other places in town).
The people running the place, Sonny, Marvin and Esther are amazing. Watching Marvin cook is a treat, Esther's knife work is amazing and Sonny always knows who you are (""I'll put in an extra fortune cookie for your son""). Eat there.
Pros: non-Chinese specialties
Cons: you need to call your order in ~40 mins in advance