To quote my own review: What we really have here is a brilliant civilization building game with many of the core hallmarks of more complicated 4X games, wrapped in an attractive package absolutely soaking in well researched theme, plays in about 90-120 minutes, and plays equally well with 2, 3, or 4 players.
With four experienced players, this game really shines. New players should never play Prussia (unless everyone's a new player). [2009-12-14]
Edit: [2012-01-25] Just received the new Jubilee Edition map in the mail. It looks really nice. The only significant change I noticed is the suits in the left hand "column" of the map have changed to club-hearts-club-hearts from what it was before. And one town name change.
Has much of the same you-are-there tension as Twilight Struggle, has a very nice take on event cards, and the addition of "alternate history" cards that have highly possible events adds to the verisimilitude of the game.