Unless you really are allready interested in buying into the time share it's not worth it. IMHO.
You usualy only get the two "free" - 1 day adult passes. And still have to buy your other days tickets.
Many of the time share skeemers give out invalid tickets.
You have to spend 2-4 hours sitting through a hard sell pressure meeting and take the tour.
Many of them call and pester you frequently after wards if you don't buy into the time share.
You waste time driving to and from the time share location.
You don't really save that much money to loose a lot of park time.
Just my .02$ just go ahead buy your tickets in advance. And make sure you are using a reputable broker not those time share skeemer.