The Mountains of Madness adventure is the best adventure I have ever run, for any game system. I picked up the extra Antarctic Expedition pack, and ordered several Antarctic books (Antarctica-A guide to the wildlife, Endurance an Epic Polar Adventure and several others (including the original Mountains of madness book) - for about $125 I have enough material to last for hundreds of hours of gaming. The players absolutely love the adventure! Preparing for a polar adventure is a blast and this is an incredible adventure book. The only thing I would like to have improved would have been a large cut-out of the ship / polar camps but the price to do that would have been very high- but could have been put in the separate adventure pack instead of patches, etc.