Highly recommended -- my group is definitely planning to come again.
Of the room escapes we've been to so far (and we've visited four in the GTA), this one definitely has the best production value. Money was spent on making the challenge room seem realistic and we were quite impressed (or perhaps our expectations had been sufficiently lowered by previous experiences...?).
The puzzle felt fair at all times. There were many, many genuine "aha!" moments of the in-retrospect-I-should've-seen-that variety, as opposed to the who-the-heck-would-ever-guess-that variety.
One thing, though -- Escape Games, unlike some of its competitors doesn't dispense with the photo memento business. Just FYI.