You get to sit in the lower sections in the "center 6" area so that's nice for those who typically don't have $200+ to spend on a ticket.
Last year most of the star players walked torwards the tunnel immediately after the session and stopped to sign some autographs. The lesser players were much more accessible. For example anyone could walk up to Harangody to get his auto as he stayed on the sideline for a bit, with really no big crowd around him. Ray Allen signed both of his shoes and threw them into the stands (actually Nate stole one of them and chucked it into the stands). Shaq signed a ball and drop kicked it into the stands. A gift was given to each person in attendance as you entered the area; it was a Celtics cap (either in white or green). Sheed also showed up and sat on the sidelines.
I think last year was a little exicting because the team outlook was great, coming off a Finals appearance, and adding guys like Shaq, JO, Delonte. This year the excitement is definitely lacking. And Pierce probably won't be playing.