Very much like the change in how troops accumulate. Forces a different type of game play. Patience is definitely required, as waiting for the right time to pounce can quickly give you the game considering the elimination bonuses.
I really enjoyed this board. The flying plus abandon makes one have to rethink many of the standard strategies. There is a little tedium in each turn having to flying around and recapture all the abandoned territories, but it certainly made the outcome in the last few rounds less clear than in a standard game.