Great coop/solo card game. Helps if you like a challenge as this game can be extremely hard. If your playing solo I recommend using two decks as it adds more options and you're more likely to survive. There is an easier option for (combat) gameplay which is good when you're starting out or even when you just get fed up of dying too many times. Also theres a really helpful turn guide at the back of the rulebook. The majority of the card artwork is fantastic and the numerous tokens look cool. The cards are quite flimsy though so it might be worth getting sleeves.
Contrary to the product description, I'm pretty sure you can play 4 player with just this set, though Ive never done it. Just take a deck each and have two players write down their threat levels whilst the other two use the dials that come the box. Having two core sets would be epic though.