This tour is the perfect way to begin your visit to Montreal. It will give you a good overview of Old Montreal so that you can plan to return to some of the locations to see more at your leisure. The pace was good, even for my girlfriend who was 8 months pregnant, and the tour guide was excellent!
The only thing we didn't realize was that there are 2 tours available - one for the east side and one for the west side - so we only did one. I would suggest booking both!