I've been here several times as well as to the Denver location. The beer selection is fantastic if a bit pricey, but the staff is fun, knowledgable and the beer flights are a nice offering for newbies to Belgian beer.
My group also liked the Rabbit Cassoulet. We also liked the curry muscles. The frites are decent, not perfect, not the "Belgian Fries Experience" I've had at Belgian restaurants in other cities but for the Denver metro area, it's a start.
I wish these dishes were done better: Croque Madame, Croque Monsieur (the bread is much too thick and not the right consistency/ freshness and the sandwich overall misses opportunities to pack the flavor punch I've experienced with this dish at other dining experiences.)
Avoid: the Croquettes de Fromage & the Beignets. They are frankly both terrible here. Making fresh beignets from scratch is not that hard. Most people could make them better than these are at home. After ordering the beignets, the waiter informed us that the waffles are much better, so I guess next time...?
If they fix their issues in the back of house and get some better training for their chefs and cooks, the Cheeky Monk could stand a better chance at lasting success. As the palets of the Denver area improves, the novelty of Belgian food will wear off and if the food doesn't improve, the franchise will go south.