I had Sunday lunch with a bunch of Taiwanese that go there frequently. Apparently as authentic Taiwanese as you get.
That much said I personally thought the food was just good and not great. We shared a variety of dishes family style including pepper beef. Nothing really stood out. Service is pretty average.
If you like Taiwanese food, this is probably the place for you. If you are ambivalent then I doubt anything will really wow you and it will be just another moderately priced Chinese restaurant.