We haven't activated our passes yet but the service and prices we have had from Ticketmania has been excellent.
Bought our Seaworld Buy one day get one free ticket in September. It took 8 days to arrive. Bought our 30 day Fun in Sun pass on December 20th arrived on 30th.
They also sell a media pack. Although its mainly brochures that are free in the USA they don't charge a great deal for it and its a brilliant way to show children (and grown up children) a bit of whats in store.
Ticketmania do, however, send the brochure for the park you have bought tickets for anyway so, as in our case, where we have bought virtually everything from them I wouldn't get the media pack until you have seen what comes free with the tickets.