I can't say enough good things about this game. A potential traitor - I love that. The theme comes to life in this game more than any other game I've played (not that I'm a big gaming officionado, mind you). And I think that's in part because of the crossroads cards. Sometimes events will happen depending on actions of certain players. For instance, you may search a location and find there are some people scavenging - and now you have to decide whether to bring them into the colony (which has its pros and cons) or attempt to steal their food (I've invented this crossroads card).
And in part, it comes to life because you feel the stress and strains that you would feel in a post-apocalyptic world at every moment. It's a constant battle to survive, and there are so many things you will want to do but only a few things you can actually do. So it forces the cooperative element also. But be aware, there may be a betrayer amongst you who is trying to decrease the group's morale, or is hoarding the food, or who knows what.
You're controlling your own entourage of people within the colony, and your group will have its own secret aim. Maybe you feel the colony is responsible for some misdeeds and you need to take revenge. Or maybe you just want to pull together and survive the winter. To win, you need to complete your own objective. And that's another reason why I love this game - different win conditions. And sometimes those win conditions will make you look like the betrayer, even though you're not.
This is a must-have, in my opinion. Great quality components, the artwork is great, and the replayability is just phenomenal. With 2 of 30 different characters you can have in your entourage (and more may join or some may die), the varying secret missions, the colony's global mission, the crises that happen every round, and the possibility of crossroads cards triggering. Just so many ways this game could play that you'll never play the same game twice