This McDonalds is located in Promenades Cathedrale's food court.
They don't have everything at this McDonalds (for example, when there was a limited time blueberry crumble sundae, I went to this McDonalds and they didn't have it). This is a typical food court stand McDonalds so generally if I'm in the mood for a McDonalds, I won't go to this McDonalds unless I want something quick like a coffee, soft drink, or muffin and I don't want to go outside because of the weather since there is a McDonalds outside on Ste-Catherine street which is less than a 5 minute walk.
Other than that, if you order their standard items (Big Mac Trio, Quarter Pounder, etc.), there won't be any issues. There is usually a line like in most food court McDonalds that I've been to. Not much to add