Great long term value
I got this game for Xmas 2009 when it was on sale (at the time) for 18 quid, which was an absoloute bargin. Since then I've dipped in and out of it for over a year and enjoyed (most) of the game. As far as longevity goes, it's a great investment and a great game to boot. Dr Ned's expansion is by far the best of the lot.
Obtained my platinum trophy for this after 16 months of playing it, and have really enjoyed the game. Best played with a few friends.