Great deck building and worker placement game. For me its up there with Lost Ruins of Arnak (currently $58 at Amazon AU) however the theming is quite a miss with a lot of people.
CamelCamelCamel reports this is the lowest price ever on Amazon
BGO reports $51 was a 52 week low at Mighty Ape excluding shipping
BGG has the game stats as:
* Players: 1-4
* Weight: 3.02 / 5 (personally I don't think the weighting is correct and I would put it lower)
* Playing Time: 60-120 minutes
Too bad the expansions aren't on sale too, I've heard from several others that they turn what is already a good game into a great game, and have become must-buys for the full experience.