Call of Pripyat Complete is the third entry in the Complete mod series, which is a set of modifications created by professional artists dedicated to enhancing the production quality of the S.T.A.L.K.E.R. game series. The Complete mod series emphasize on improving the original graphics, sound, and atmosphere of each game while preserving the core game elements. Built upon the success of Stalker Complete 2009, which was downloaded by one in every five S.T.A.L.K.E.R. Shadow of Chernobyl players, this entry in the Complete mod series is the cumulative culmination of the series’ achievements in aesthetically updating the game without changing the original story or gameplay. Designed to meet the desires of new players and veterans alike, Call of Pripyat Complete unleashes the full potential of the latest, climactic chapter in the S.T.A.L.K.E.R and the Complete mod series.
Like the previous Complete mods, this mod is in my opinion the best combination of modifications that don't alter the original game.
I used the latest version and didn't have any of the problems others reported, except the few XRAY engine crashes the STALKER games always have. I played through the whole game, finished all quests I ran across and collected about half of the possible achievements, so it was a pretty thorough playthrough.
One thing that was definitely missing is a FOV fix. There's a tool for that, but it's pretty hard to get nowadays, as most mirrors are down.
For your first play through of Stalker Call of Pripyat, this is the way to go. The graphic enhancements, minor and welcome gameplay tweaks, and bug fixes make this the way Stalker CoP is meant to be played.
I also recommend you check out the Misery mod after you have finished your first play of the game with the Complete mod.