Great window display, great selection, friendly staff, good prices, and a decent enough in-store soundtrack all three times I've been there. Along with the Hockey Hall of Fame, Kensington, and St. Lawrence this is one of my "must visits" every time I come to Toronto.
I've been to Rasputin Berkeley, Amoeba LA, Amoeba Berkeley, and myriad other music stores - along with Vintage Vinyl in St. Louis this is my very favorite for selection and only lags behind Used Kids Columbus for price.