It's a good deal.
Two adult tickets was a total of $81 Canadian. That gets you three days (not two) of hop on hop off sightseeing. Also included is a 45 minute boat tour of the harbor where you can take some nice pictures of the Toronto skyline.
The tour hits all the major spots: CN Tower, Rogers Centre, Casa Loma, The Hockey Hall Of Fame, St Lawrence Market, Eaton Centre, Dundas Square, etc.
The stops are either right in front of the location or a short walk away.
It's a good deal.