I am not typically a fan of hop on hop offs but the Gray Line Montreal was great! We road the two hour loop to get a feel of the city, hopped off for some shopping, hopped back on to make it to the Saint Joseph's Oratory of Mount Royal.
I really enjoyed how the tour was in both French and English. All the tour guides were very personable and nice! I would say that this bus is not handicapable, however we were able to bring our transport chair onto the bus because we went during shoulder season.