The reason it is a concern is because the offer is found on the Universal UK website (http://www.universal-bookings.co.uk/park.html)and says that valid photo ID is required. The only place in the USA that it is found is on the Viator website that no one had heard of before.
Here is the info as stated on the Universal UK website:
"A brand new ticket for customers visiting Universal Orlando Resort in 2009, the Universal 2-Park Bonus Ticket offers unlimited admission to both Universals Islands of Adventure® and Universal Studios Florida® for up to 2 weeks.
Tickets are activated the first time you visit one of the parks and you can visit both of the parks as many times as you like during this period. This great value ticket also includes all-club access to the live entertainment at Universal CityWalk®.
Ticket is valid for up to fourteen (14) consecutive days including the first day any theme park or CityWalk portion of the ticket is used. The Universal CityWalk® component of a ticket is not valid for separately ticketed concerts and special events. Some venues require ages 21 or older for admission. Valid photo ID required. Does not include admission to Universal Cineplex 20, an AMC Theatre or the Blue Man Group show. Subject to availability."
Personally, I would check with Universal before purchasing this particular pass. There have been issues before with agencies selling passes and not giving all information (ticketmaster). It could be perfectly fine but better safe than sorry.
Thank you for explaining to me. I didn't understand that it was a link for from a UK site.
Unfortunately, I have already purchased. Since they appear to be a reputable ticket sales agency, and there were no restictctions in their terms, if there is an issue I would expect them to make good on a refund. I certainly would not take the loss lying down.