Despite my distaste for their organization generally, you're going to be hard-pressed to find a fast food restaurant that offers better GF options and service.
Safety
Safety Feature Ratings
Dedicated gluten-free fryer
Quality & Quantity
Is there a gluten-free menu?
— Gluten-free items are marked on the main menu
How much of the menu is available gluten-free?
— Most/All
How would you rate the taste and quality of the gluten-free food you tried?