I was told that I must try poutine while in Montreal. French fries with cheese curds covered in gravy? Yummmmm. I have not tried poutine anywhere else so I can't make any comparisons.
When you enter, go left for take-out and go right to eat-in. I had the Classique while my wife had the Rachel (peppers, mushrooms, and onions). Both were pretty darn good. If you love fries and have never tried poutine I can't imagine you being disappointed with the poutine here.