Hands down, the best burger I've ever eaten. I had the HK burger and my wife had the Brittania, and both of them were flat-out phenomenal. "It's cooked beautifully" (in my best GR voice. The servers are very attentive, the pricing isn't bad ($15 for this burger wasn't out of line, IMHO), and everything about the restaurant smacks of attention to detail.
Try the sweet potato fries. Absolutely delicious.
This place is worth the wait. You could also wait until after midnight, usually there's no line by then.