I'd basically given up on good Chinese food in Madison until QQ Express opened up just earlier this week. During the week, the entree selection offers way more options than you'd see at a some place like Panda Express. The weekday specials are also very reasonably priced, and offer way more variety and volume for a dollar more than the Subway located next door. But what keeps me going back is the amazing quality of the food, and the variety on the menu.
The Black Pepper chicken has pepper so fresh it's actually still spicy. And I've had the peanut chicken 2 out of the last 3 days.
On weekends, they also have Dim Sum until 3pm.