Ive pretty much been eating at various Kings' pretty regularly since I was a child when my parents would take my sister and I into the Fox Chapel location often. Lately me and my girl have been visiting the Heidelburg location. I love the food, it really tastes homemade, much like something a grandmother would make, complete with gobs of butter and side dishes. Prices are low, selection is great, but dont expect fine dining by any means.
Service is hit or miss at pretty much all of them; if you have lunch at any Kings, you will likely be waited on by a sweet but sarcastic older lady who has been doing the waiting thing for 30 years and knows her game. Seek out this lady. My experience with the younger crowd at night isnt the same.
Im in my 30s now, and very little has changed, other than the Fox Chapel location was remodeled about 10 years ago to look less like a diner, which was a big fail. Any girl I meet has to enjoy Kings or she's out.