It's kind of hard to review a convention center but I'll give it a go. If you have a conference or convention in Montreal then there is a good chance it will be here. It is in Old Montreal and can be accessed directly from Place d'Armes metro which makes it very convenient to get to. From the outside you can easily identify the building by its giant stained glass facade which I have always liked. Inside it is very updated. There are plenty of small rooms in addition to the massive exhibition hall.
If you're here for an all day event the food options won't be the best. There are a few fast food places on the metro level but they're just your average chains. If the weather is nice venture out into Old Montreal to see what you can find. Trust me you will be glad you did.