I know this place is for kids, but I loved it! We purchased the Nature Package, which gives you access to the Biodome, Insectarium and Botanical Garden. If you're a college student and have your ID on you, it's only $21 for all three, which I think is a pretty good deal.
I wish they could add more ecosystems over time (they only have 5 at the moment - Tropical Rainforest, Laurentian Maple Forest, Gulf of St. Lawrence, Labrador Coast, and Sub-Antarctic Islands), but I don't know if that would be feasible.
The Tropical Rainforest section really reminded me of the Tropical Rainforest exhibit in the National Aquarium in Baltimore. My favorite exhibit would have to be the Sub-Antarctic Islands though! The penguins and puffins were ADORABLE.
I didn't get to see the "Room of Death" that other reviewers talked about - and that's probably a good thing.