I've been to the show once. It's good for a few free or discount passes and our friends found a good deal on a Killington trip. Supposedly the gear vendors have downsized by a large magnitude. Even more fun is to rent a blue bike and blast around the seaport and southie.
We accidentally happened upon this show about 4 years ago. We had travelled to the Boston area specifically to pick up a new MTB for Robin. We rode some local trails in the burb where we bought her bike (Santa Cruz Superlight) and had booked a hotel in South Boston. We rode all around Boston the next day, Saturday, visiting the Commons, a ride by of Bunker Hill and the Constitution, meandered along the river Charles, cruised by BU, Robins alma mater. Tons of fun - we love touring cities by bike.
Gazing out our hotel window Sunday morning I saw a guy walking down the street with a pair of skis slung over his shoulder. Turns out there was this big ski show right around the corner. So we went and had fun checking out all the areas and gear and got some halfway decent swag as well.