I believe the owners have a family member who is celiac. They really take it seriously. I have ordered many sandwiches (including cheesesteak!) from them and never had a problem (be sure to mention you have celiac). They also have gluten free cheesecake (!) and sell a small selection of gluten free packaged dry goods -- crackers, cookies, etc., which is convenient.
— Very
— Separate gluten-free menu
— Some
— Excellent