Settlers of Catan

ok....this isn't actually a video game (although according to this link it is going to be....that's news to me), it's a board game. http://en.wikipedia.org/wiki/Settlers_of_Catan

Just checking to see who has played it....and who likes it. If you haven't, it's a fun game to play during family get togethers and things like that. We played the other night and had such a fun time...that we played again right after. I hear it's fun to get the expansion sets such as the Seafarer's of Catan. Your thoughts?