I've been to both locations now and both are fairly busy - depending on what time you visit, of course!
On a Sunday afternoon, late lunch, the St. Clair W location was quite packed. A young male waiter with long hair and glasses spotted us and recognised that we wanted something quiet, so we were sat right next to the kitchen. At first, I thought it was weird, but he was right, it's actually the quietest table in the restaurant! Feels kinda separate from the busyness upfront...until you hafta scoot around people to head downstairs to the washrooms. ;)
Ordered the grilled calamari, quite good. (I would've preferred the breaded version, but I was *trying* to be healthy.) And for main, the Primavera pizza ($14) was shared. Due to the toppings like sundried tomatoes & olives, the pizza was on the saltier side, but still didn't feel too heavy because of the thin crust.
Aside from the really thin crust, what sets their pizza apart is also their CHEESE! They use really good, chewy quality mozz, yum!!!
Service was very pleasant, mainly due to the waiter who seated us. His personality was very upbeat and understood my needs which added to the experience.