I was a part of a big group and it was an awesome tour. In terms of the actual tour you could read my other friend's review's for the details.
But, I wanted to share my experience with cordinating and booking with Shea and the guys at Fitz. He understood that we had a group had a group of 16 and we were not that experienced with Montreal. He asked about our overall itinerary and plans beforehand. Not only did they work around our schedule but he actually gave us suggestions on how to plan our weekend before we even booked their tour. We had to change our tour start time a few times, but they were always cool with it. Their flexibility was great considering we were dealing with so many people in our party.
Montreal is a BEAUTIFUL city and Fitz $ Follwell Co is the best way to see it's beauty. These guys are knowledgable and have the best customer service.