I found it underwhelming for the admission price. The habitats are not very large and the entire complex isn't very large either. There's just not that much to see compared to similarly priced famous exhibitions (say San Diego Zoo, NY Botanical Garden, etc.). I understand it's a little different from a traditional zoo, but I wouldn't make a stop if I were just a tourist. There are better things to see in Montreal if you have a limited amount of time.* It's just not that biologically diverse and very expensive per square meter of viewing space.

*For perspective, I go to Montreal multiple times a year for decades now, and I only went to the biodome once as an adult. If I lived there, I would probably take my kids.

Recently renovated, too.