I'd rather eat my own shoe.
The people behind the counter are either stoned or super bitchy. Some of them don't speak loud enough for you to hear them in that noisy hell hole. As a result, they mess up your order and make no attempt to correct their mistake. The food is ok at best. I have had much better food, which is not too hard. Customer service is lacking, the food is lacking, and the ambience is dismal. Stay away.
I really can't imagine why Falafel King is so very popular. I went there once and couldn't even finish the gyros I got, it was just plain old yuckky. There are much, MUCH better places to get Mediterranean food in Boulder, such as the little place on Pearl near 26th.