First time using Citypass in one of their cities. Its a pretty good deal unless you are with kids. I hate that you are forced to choose between the Toronto Zoo or the Ontario science center. The kids wanted to do both. If I really had a choice in choosing what I wanted out of the six locations, I would've skipped Casa Loma which we did skip anyways.
Other than that, the perk to skip the ticket buying lines was nice but not neccessary during the time frame when we went which was offseason. I would suggest buying the booklets ahead of your trip rather than buying when you get there. which allows you to skip the lines right away. It was somewhat helpful at the aquarium. Just go straight to the where they collect your tickets. No need to go to the front desk.