We've been using the PhotoPass ever since they first came out -- prepaid whenever possible for the discount. LOVE IT!!!
When it is just the two of us, it allows us to have pictures together without relying on strangers, who may or may not be very good photographers!
We used it for an extended family trip in 2009 -- loaded all PhotoPass cards onto one account, and we had photos of everyone even when we had split up for the day. Framed photos and made scrapbooks albums for each family unit and the grandparents for Christmas that year.
Used the PassPorter+ last March -- it was definitely worth it for the rides and photos taken at Chef Mickey's and other dining options, and will do it again next year for another extended family trip!
You will get the CD of photos and legal release to print as you choose -- for family members, holiday cards, etc.
You will not regret it, I promise!
Have fun,
Ali