The ROM had some amazing reviews so it was on our list of "must do" while we were visiting Toronto. We purchased a CityPass while we were there and the staff was really friendly about explaining it and giving us some tips.
We wandered around the museum for at least four hours and didn't see everything. All of the exhibits were huge and beautifully arranged. Lots to see and experience. We loved the dinosaur collection and how fun and informative the exhibits were. Almost every collection was very in depth. We started at the top of the museum and worked our way down through most of the place.
Definitely pay the extra fee to see Chihuly. There are so many beautiful pieces and it was mesmerizing. My dad collected art glass so it was a little emotional, but a must see.