This is the third time I've been to the Convention Center for the Pittsburgh ComiCon with my husband who's a collector. I really do enjoy this location... The facility is very large and accommodates large events well. The restrooms are plentiful and there is a place for snacks. Parking is pretty good.
Only negative I really have - smokers. You can't walk in or out of the place without having to deal with cigarette smoke blowing in your face. They should really have a designated area for smokers - AWAY from the main doors.