My wife and I have been visiting Yao for several years. The food is good and the price is very reasonable. I have to say that Shirley, the owner, is what keeps us coming back. She always greets her customers with a warm smile and friendly "hello". I also love this place because it reminds me of my first experience with Chinese food as a kid. Ironically Yao offers a nice break from the PF Chang-style Asian cuisine in both it's simplicity and its price.
I have noticed that on busy nights the staff can get a little backed up with the influx of To-Go orders, but I've always been very please with the service level and attentiveness of the wait staff.
Can't say enough nice things about this place as it's a real favorite.