The burgers are definitely on the big side, with the triple kingburger combos easily your 2000 calories for the day. Whilst the cost is on the pricey side, the burgers are by far the best I have had anywhere. The restaurants have a consistent 50's appeal and are very well maintained.
I first went to the Issaquah store, and was pleased when the Bellevue store opened. Well worth the trip and cost. You will be guaranteed to be full afterward as well.
Pros: Feast sized burgers, Well worth the price
Cons: Expensive, No value menu
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