Although I don't regularly wear a tux to black tie events (I'm more of a suit type of guy), this is an awesome place to go for a tuxedo. The staff was extremely helpful and really went out of their way to make sure my tuxedo fit the way I like it. I don't know how large that backroom is, but the woman who helped me pulled out a huge variety of things for me to try to make sure we were getting all the right sizes. I was very impressed by how knowledgeable and thorough the staff was. I told them I was a little picky on the fabrics I wear and they immediately suggested a high grade wool for me that was perfect.
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