Interesting perspective of the stadium and surrounding grounds but is it worth it?
On our recent visit to Montreal, we bought tickets and rode the funicular. It is easily found from the subway. It is a unique experience, but, upon further reflection, I'm not convinced it was worth it. We did have great views and could spend as much time as we wanted at the top. I feel like we got a better feel for the area by walking around. If you are an avid Olympic fan, you'll be sure to enjoy. Otherwise... I'm not as sure. I would budget, from standing in line for the tickets to getting off the funicular and exiting the building, about an hour.
Also the area doesn't have many restaurants. If you are planning on lunch, be prepared to walk a few blocks. We did and were delighted. If you are planning a visit to or from the insectarium or botanical garden, it is an easy walk with good signage.