Porter Baltic special edition from Les Trois Brasseurs is awesome. It fills the mouth more than the regular edition, almost like a minty flavour. Other brews I was impressed about came from Les 3 frères. The Quadruple is the best beer I tasted on Friday. Their Imperial IPA is also noteworthy.
Other show stoppers I've tasted:
Brasseur de Montreal: Double IPA... Really sharp IPA taste. Very very well balanced beer.
Malédicrion from Saint-Bock really tastes like a milky ale.
Some Labrador Tea ale from Haricana was impressive.
Some "wee strong" scotch ale from Le temps d'une pinte was pretty good.
Now that all said, I'm drunk, so i have no idea wtf is going on, I'm not a pro like Seb..These were not so impressive:
Genèse: Dieu du Ciel... Usually get some good beer from them, I just chose the wrong one. Tasted too much like vinegar to me.
Rastafayan from Noire et blanche... Overkill, too many flavors in one brew.
Probably going back tomorrow, even Boreal has festival brews...