All my review is based on the Agassiz research center.
Ag Canada is an extremely fun workplace (especially for student workers) and a challenging one depending on your passion/abilities and who you work for. I was fortunate enough to work under a researcher that helped me grow exponentially, but I have seen other students do mostly physical labour work. Work culture is relaxed and professional at the same time. The management encourages lots of communication between all of the employees, and a social committee holds lots of sports and social events. The most enjoyable and hardest part of the job is that it is challenging. Most scientists working there are world-class scientists in their respective fields, and thus expects the highest quality work at all times. This is no easy feat, but also comes with a rewarding feeling.
The only problem I found working at the Agassiz research center is that it is too remote.