We're in town from Florida for a couple of days, and did the 11 AM Saturday tour with Tim. Our tour lasted almost two hours, and it's readily apparent how passionate and knowledgeable he is about the area's history (and Benjamin Franklin in particular). He injected just the right amount of humor throughout the tour, and his stories are filled with tidbits of information that you likely haven't heard before.
As someone who has an appreciation for the city and it's history, his passion really resonated with me and I'd wholeheardedly recommend this tour to anyone. I'd also disagree with a previous review that stated that Tim had a strong regional accent. I didn't find that to be the case at all, and I thought he was very easy to follow.