The last time I went to this restaurant they put cheese on the pizza I ordered even though I asked for no cheese. Normally I wouldn't mind having to wait but they did not even offer an apology :(
I also heard some who had a gluten intolerance ordered what she thought was gluten free but was not.
I am not sure if they keep ingredients separate when prepping. Finally, when I went they did not have have vegan cheese, tofu, or seitan.
Updated from previous review on Saturday April 27, 2013
Update on 12/27/14:Atmosphere nice but charges extra for vegan cheese!?!? No notice about extra charge before order either. Other mellow mushroom don't charge extra. It would've been fine if I'd been told about the extra charge when ordering or when I called ahead to ask about the vegan options. They did ask if it was an allergy and if food needed to be cooked separate.
Cons: charges extra for vegan cheese