I tried a "supreme" chicken shawarma pita on the weekend. A supreme means they add hummus and tabbouleh as well as their usual toppings.
I found my sandwich was very thin and light. I don't think they're doing this on purpose because my dining companion's sandwich looked pretty hefty and wide. It's obviously just a consistency issue. Normally a shawarma pita from any shawarma place fills me up, but this was definitely merely "snack-sized" for me because of the lack of heft.
The chicken tasted pretty good and the veggies seemed fresh. A couple of disappointing things (aside from the thinness of my sandwich): the garlic sauce wasn't very garlicky, the hot sauce wasn't very hot, the vegetables on the pita were tomatoes lettuce and onion (no pickled turnips, pickles, or hot peppers), and I didn't taste any tabbouleh. I don't know whether he forgot to put tabbouleh on or maybe they just skimped and it wasn't detectable.
This place is great for persons who are averse to strong flavours, but it's not going to satisfy those looking for really garlicky sauce, spicy hot sauce, and awesome pickled turnips.