It's a blast. Not very serious but that's why the bulk of us love it! It's the unofficial start of summer around here. I've only missed it once in 11 years.
Make sure you catch it all: fri night at the HYC - party it up and then walk into town for dinner; the tent party on Nantucket Sat night, the joke tent on sunday and the great general boating "scene" in the boat basin.
One thing is guaranteed. 25 knots at the start dying to zip halfway across the sound.
Are you in the spin class?