I can tell you what I know. It's good for 30 consecutive days of admission to the 4 major parks, the 2 water parks, Disney Quest (which is NOT covered by a regular "plus" feature on the PHPs), the sports complex (I think, but we won't be going there), as well as some other smaller attractions in the central/south Florida area. Sorry, the only one I remember of these is Kennedy Space Center, because we may do that. The others seemed pretty obscure to me (no Universal, Gatorland, etc.), but that's my opinion. I understand the breakfast vouchers also come with this pass. It seems to be the best deal for someone who plans on 7+ park days, and plans to do the waterparks and/or DQ at least once, AND will not be going to Orlando again within a year.
Thanks for posting what you found out about BBB. We are going in Dec. for about 14 days and at this point are planning to purchase the FITS pass. Don't remember seeing when you are going, but I will be sure to post our experience when we return.