Probably the best teriyaki chicken you'll find in Madison for the price it's at. Compared to the other two options for Asian food at the West Towne mall you'll get the best bang for buck from Sarku.
I wouldn't recommend any of their other menu items though, and for some reason I always confuse "Chicken and Shrimp Tempura" for Chicken teryaki and shrimp tempura - which it is not. It's chicken nuggets and 2 small pieces of shrimp. Not recommended.