We had lunch at the Regatta Bar & Grille in the Delta Hotel on a recent trip to Toronto for my brother's wedding.
The Reuben itself was excellent, having not just two but three half sandwiches, each bursting with meat. No mere token side of potato chips here: This Reuben came with an entire salad. An excellent value for just $9.75 Canadian (about $7.50 in real money).
The waiter was very attentive, probably because we ate at an off-peak time. The atmosphere was interesting, featuring pictures and models of all different kinds of sailing ships.
The great value, atmosphere, and friendly service combined to make this a wonderful place to get a Reuben north of the border.