Museum Pass: Worth it?

After reviewing your touring options, you may be wondering whether the Museum pass is worthwhile to you. I would say that it depends on how interested you are in museums and historical sites as well as how much time you like to devote to each place you visit.

Note: The $5 extra to get public transit covered will be worthwhile to you as not all the locations are nearby one another. The plus for the non-transit museum pass is that you can pick any three days out of the year to use it, they don't have to be consecutive. I'm harping on the public transit pass option because that is what I purchased when I was there, so that is what I have experience with.

Materials received: red Museum pass card, metro pass (white L'occasionelle ticket),
several coupons for local attractions (yellow), a metro map, and plastic sleeve.

Should I buy the pass?
Each museum charges between $12 - 20 for a single admission. So to at least match what you have dished out initially for the pass (currently $75 without transit option), you would want to visit a minimum of 4 - 6 sites over the three days. This is more than feasible - it's easy, so if you're dedicating your time to museums and historical sites, you should definitely purchase the pass.

To maximize your benefit:
If you are planning to devote 1.5 - 2 hours to each site, you can probably see four sites in a day (as most places are open 10a - 5p) in a pretty fast-paced day. In total, you would then see 12 sites over the three day span, which means you saved 1/2 the dough you would've spent on paying each individual admission.

Sample itinerary 1:
Montreal Museum of Fine Arts
McCord Museum
Montreal Science Center
Pointe-à-Callière Museum

Sample itinerary 2:
Planetarium
Biodôme
Chateau Dufresne
Botanical Garden
Insectarium
(The Olympic Stadium is in the area, too)

What about the annual pass?
Based on the above sites-per-day calculation, you would have to visit between 12-18 sites to at least make up the initial cost of the pass. If you are staying for 5 days or more, this might be the best option for you. If you are traveling with a friend or spouse, the deal gets much sweeter a single annual pass grants you both admissions into the sites (a single person gets two individual visits to each site). Unfortunately, this option does not include any public transit, so you'd have to take on that cost separately.

Final Note
It would be hard to spot on the Montreal Museums pass site, however, the 3-days-plus-transit pass is activated as soon as you buy it. Therefore if you buy it at 5pm on a Wednesday, it will be active from 5pm Wednesday through Saturday 5pm.