My family visited the Basilica, and at first we were a little reluctant to pay the $4 tour fee for adults, $2 for children, but everyone we talked to indicated we had to see the inside. We're glad that we did.
The interior is enormous with a number of chapels throughout. My youngest daughter was amazed at the amount of gold gilding in the basilica. My youngest son, however, wished there were more lights on during our visit as it was a little dark. The guided tour in English or French provided a history of the basilica and took us to the behind the main altar to the "wedding chapel" where most of the current weddings take place. Even that chapel was large. Before and after the tour, we were able to walk around and view the church on our own.
I would agree this is a must see attraction in Montreal!
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