I have dined here twice in the past month. We loved it so much the first time, we had to bring the kids in. My wife is a coeliac and felt very comfortable dining her after speaking with the staff. After her burger, she did not have any negative side affects, and she said it was the best gluten free bun she'd ever had.
The staff are friendly and I think for the most part the portion sizes are very generous.
The only negative thing I would say is that the beef patties could be slightly thicker, as they can get overpowered by the generous amount of salad. The cheesy fries are delicious and a great portion size.
Keep up the great work with keeping the gluten free food separate as my wife is putting it on a gluten free safe eating page.