I’ve been there a few times. Never had a reaction. When ordering make sure to tell them you have an allergy or are Celiac. They will mark it on the order receipt. You can order any of the burgers with GF buns. They will change gloves and clean the workstation, however, I ask my bun not to be toasted (they don’t have a dedicated one) and not Mayo because they change the utensils they use to put it in your GF bun, but the Mayo itself is still the same. So cross-contamination with the Mayo is very possible.
Fries are awesome both potato and sweet potato! They have a dedicated fryer.
My fav burger is the Colorado with green Chile!
Staff seemed knowledgeable. I had the burger with gluten free bun and fries. Didn’t get sick or experience any symptoms.