So I have a history with the Old Montreal location. I'd been there at least 5 times for dinner or 5a7 and loved mostly everything I tried food and drinks wise. The service was also pretty good in a chic environment. Alas, they've closed for good.
I've been to the Crescent location twice. Once for a family celebration when it first opened, and once last week for Mtl a Table. I prefer the Old Port location. The service here is less attentive, the decor is less chic, filled with a rowdier crowd (probably because it's on Crescent). The servers aren't as knowledgeable about the menu... I could go on.
During my last visit for Mtl a Table, I was disappointed. The server kept getting messed up on details, we never received bread, and overall, there was a lack of finesse.
I tried the lamb empanada, the hanger steak and the lemon chocolate tart for dessert. The food was very good overall. The steak was 2/3 of the size of a normal hanger steak that I've enjoyed at Atelier D'Argentine previously... we had to ask for the chimichuri sauce because it was supposed to come with the steak...
They have good 5a8 "happy hour" specials so maybe I'll give their happy hour or infamous boozy brunch a shot in 2018.