I have little experience with convention centers other than this one and another one in Philadelphia. However, there are some good things to be said about this one. First is the enclosed walkway between the Westin and the Convention Center. If you're staying at the Westin, this walkway is great for a rainy day or if you don't wish to go out into a hot, humid outdoors. In the convention center, the corridors and halls are spacious. There are quite a number of well-maintained restrooms. On one side of the convention center, the balcony overlooking the Allegheny River offers a great view and a chance to get some air.
Downsides: The connection between the Westin walkway and the convention center is a slow elevator, which you have to take one level up/down. This problem could've been solved by having the walkway be one level higher from the 3rd floor of the Westin. Parking is expensive in this area. We expect that for a city setting but you'd have to go out a few blocks to find anything under double digits per day.