I've never had a reaction because of cross contamination, but I had a full blown allergic reaction to the gluten free bagel (wheat allergy here). This might be fine if you're intolerant, but I wouldn't eat here if you have celiacs, an allergy, or are sensitive.
Note, I didn't have a sandwich or anything (I just took away a full bagel), so the cross contamination must happen during baking.
— Not at all
— Gluten-free items are marked on the main menu