This was an amazing addition to season 5 of AL play, and the mini-epic option proved to be worth running this again at our local game store.
In both instances, the players were hard pressed, and in fact failed to finish within the 4-hour time slot. Fortunately, we were playing at a store level, and not at a convention, so time was not such a factor. However, for those planning to run this at a convention, be aware that it seems to run longer.
The point system for successes on preparations against the imminent attack was quite useful, especially when using visual tokens for those points. As those points then dwindled away during the final attack, players had to start worrying about how much to spend and when, adding a distinct level of anxiety (which was fantastic)!
I definitely recommend this module, and if possible, the chance to run it as a mini-epic.
[4 of 5 Stars!]