Ordered 'Treasure of Dodo Island' for a 9th birthday party, it worked really well, the kids (8-9) loved it and completed it in about 45 mins with just a couple of pointers. I think it would be a bit tricky keeping a large group engaged though, we just had a group of 5 so it was easy for them to gather around the puzzles.
The instructions for setting it up were really clear, although I would recommend not leaving this until the last minute (it took me longer than 20mins to set it up)
I ordered the printed version, although it would have been good to have a backup soft copy as well (incase any of the activities go missing or you make a wrong cut).
We'd do another of these, I definitely recommend for a party activity.