Came here with my fiance on a Friday night, we arrived without a reservation and had to wait ~20 minutes for a table. It was no biggie since Nadege is 1 minute away (a delicious bakery you HAVE to try). They also took my phone number down so that they could call when the table was ready.
Ambience: We sat at the bar and saw all the oyster shucking in action. The place has dim lighting, was on noisy side and definitely crowded (I could easily hear the conversations beside me).
There's a map showing the locations of all the oysters which was fun to learn. There are lots of interesting posters on the walls.
Food: Oysters were fresh and shucked well, there was a good variety. I like mine with a bit of lemon and horseradish. We got 2 of 7 different types, some raw clams and reordered a half dozen of our favourite (kumamoto). We also ordered fish and chips - nothing memorable.
Service: Before the meal: great. During the meal: average.
Oyster Boy was A-ok. Perhaps if I had better seating at a table instead of the bar I would of had a better experience.