Don't mind the people whining about poor performance. The patch released yesterday fixed all of that, now I run the game all settings maxed out on my GTX 770, without any fps-drops or crashes. This game is absolutely amazing and one of the best ones I have ever played!
The least atmospheric of the S.T.A.L.K.E.R games as everything in the first two levels looks bright and dry. (The third level brings back the much better dark and gloomy atmosphere seen in the other S.T.A.L.K.E.R games) Other than that this is a really nice game and a worthy follow up to the amazing "Clear Sky" and "Shadow of Chernobyl".