My husband and I found the Biodome to be a nice diversion.  As a teacher, I would want to take my students there.  It best serves to educate about some of the different biomes on Earth, and is a very good resource if you happen to be a local educator.  We spent three hours there, as I like to sit quietly and observe.  The least favorite of mine was the Antarctica environment, but I had great time observing the rain forest, woodland forest environment, and the Madagascar exhibit was highly entertaining made possible by the visiting lemurs.  I also think it was the first time I had ever seen a cappyberra swimming around in any zoo/exhibit.  If you have kids, this place will be a learning experience, and if you enjoy going to zoos, this place may not be the cutting edge of zoological technology, but it is a pleasant time spent while there.