I went here a few times. Three times for dinner, and the rest during after hours. Oh, and once for breakfast because my company decided to use their caterers. Probably one of the best places to get poutine in Montreal if you don't mind the sometimes long waits.
If you're not picky with where you eat, you can use the often-much-faster take out line, take your delicious poutine to the bar next door (BYOF) or go eat at Parc La Fontaine in the summer.