I went to the class yesterday to see what it was like. It was an hour long. Most of what was covered I had already figured out but did learn a few new things.
Unless you have a tough time learning new tech, I think you would pick most stuff up on your own quickly or through use of online tutorials, etc.
They did have a demo watch set up for use by someone who was in the class but hadn't received his watch yet.
Was fun to go in and have the staff and others ooh and ash over my watch, though!