A must see if you are visiting TO! Easily accessible from the subway - Union station stop. I have been to the Tower a number of times and each visit is good. Stand on the famous glass floor, if you dare! If you are feeling more adventurous take the really small elevator further up to the SkyPod - (extra).
Alternately, if you want an experience of a lifetime and are willing to face your fear of heights try the Edge Walk. I did the Edge Walk with my family! You will be walking with a small group of fellow dare devils and an expert guide outside the Tower on a platform built REALLY high above the City! Completely safe and a super experience. The cost of the Edge Walk includes the outdoor walk lasting approximately 30 minutes. The ticket cost of $175 CAD includes the walk, a keepsake video, printed photos and certificate of achievement. Participants also receive a Tower Experience Ticket which includes access to LookOut, Glass Floor, SkyPod, Movie and Motion Theatre Ride. Definitely worth a go.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.