My fiancée has celiac and finding restaurants with gluten free options that also use proper procedures to avoid cross contamination is difficult, but we decided to give Planet Sub a try.
I am so happy to say that she didn't have a reaction to the gluten free sandwich she ordered. They cooked her sub separately, brought it out separately, and their customer service was awesome.
Finally a restaurant that boasts gluten free options and can back that guarantee!
Edit: I should also say that gluten free bread is usually not very palatable and has weird texture, but her sandwich was delicious and the bread was amazing!