Our guide, Rachel, was outstanding. She was knowledgeable, friendly, good to be with. Our group was only three people, but that didn't affect the quality of the tour whatsoever. The two-and-a-half-hour tour was comprehensive and engaging from beginning to end. Be sure to wear comfortable walking shoes as the tour takes in a large slice of downtown Pittsburgh.
Looking at the ratings left by others who have taken this tour, it's clear that participants held Rachel in high regard, and with good reason. There's a lot of history (and some folklore) to be learned on this most worthwhile tour.