I bought this game because I heard good things about it when it came out, but my rig wasn't fast enough back then. Now, I'm playing the game 10 years after its initial release and it holds up really really well. It's not as scary as people say though. It's thrilling and atmospheric. I'm really enjoying the game so far (26h of gameplay). It's highly recommended. Even with a low end pc you can really enjoy the game. If you like the Alien universe and specially the first movie, it's a no brainer.
