I was in Montreal on vacation and visited this place on my last night. It was the best bar I went to (out of about 10) during my 5 day trip. Bottom line is that if you like cocktails, you'll love this place.
Even if you're not into cocktails, the drinks here are so good, and so imaginative, I think you'll like this place anyway. It should almost be a tourist attraction, and a top 10 one at that. Check it out. It's about a 10 block walk from the metro, so you may want to bike here.
PS - I had about 4 drinks...they were all great, but the Jerky Jack Lab was really a standout. BBQ, Jack Daniels and beef jerky - it's better than it sounds and that drink alone is worth the trip.