The food was really good and the staff weren't thrown by vegan options at all (they were also all really nice). They have a separate menu for "meatless Mondays" where all the pizza & sides options are meat-free (meat still available). Vegan options are also available all week.
The pizza was really, really good. I wasn't excited about any of the pre-made vegan pizza options, so I did a build-your-own. It turned out really tasty, but at $12 for a small (more like a medium from somewhere else) and then $1.50 for the Daiya cheese and $1.50 per topping (large is $16, then $2 each), it can add up really fast.
I will say, they put a lot of each topping on, so you'd probably be good stopping at 3 or 4, which would make it pretty reasonable. They're all high-quality ingrediants, so the pizza is very high quality.
The only vegan dough they have is the thin crust, but the waitress did say that if you gave them a few hours' warning (like 6), they could do a deep-dish vegan pizza, they just don't keep it on hand.
If you do stop by, I'd also recommend the local root beer. Fitz's (I think....)
Cons: Thin crust is only vegan menu choice, Spendy for custom pizza