If you haven't tried this already, the Complete mod for Clear Sky is a wonder. Leaves the basic gameplay as original, with all the irritating problems and bugs taken care of. Graphics, sounds, and music are all greatly improved. I highly recommend this mod, and the Complete mods for SOC and RTP as well.

I guess they're good if excessive bloomeffects don't bother you, gameplay has changed a lot also in that the game becomes significantly easier and the Complete mod for Call of Pripyat still has a gamebreaking bug to the last of my knowlegde.

Never encountered any game breakers in Call of Pripyat in either vanilla or this mod. The only real difference to gameplay in SOC I saw was the ability to get your gear repaired in 100 rads and the Freedom base, for a fee. This was added in CS as well, at the swamp base merchant and at the base in the Cordon.
As far as bloom goes, you can set it as you like, from off to excessive. The biggest changes I saw was that about a thousand bugs were cleaned up in Clear Sky so it's not just a frustrating mess, and is actually playable now.

When I said bloomeffects I actually meant excessive brightness and yes you can change it but that means you constantly need to change it because of the time of day, midday is way too bright for instance. The Complete mod for Call of Pripyat had a bug that you moved back from one area to another the game would crash, which the vanilla didn't have. Solving bugs by creating new ones plus that the gamebalance has been thrown out the window is not what I prefer. My next playthrough will be with the ZRP mods, they mostly do the same as the complete mod but without completely messing it up.

There are a few game breakers in CoP, and some carry over to mods like Complete and Misery (a missing body, going into an open bunker that should be locked, getting stuck in a certain spot were a trigger fails to move things along).

They're very random and loading a game that's old enough can give you another shot at missing the bug. Complete seemed pretty good at avoiding the bugs and ran into 2 game breakers a few times in Misery excluding the 1 I knew how to avoid (all also in the original) though I did play through Misery many times extensively so game time wise I'd guess those bugs didn't actually happen more often.

For me, having put countless hours into CoP (original/Complete/Misery) Complete was the most stable for me and I'm the kind that runs back and forth doing as much as I can, selling all I can, wrapping up everything first if I feel there's a point of no return etc, in other words playing and exploring extensively as opposed to just following the next quest.

Unfortunately the Stalker games are rather finicky in that one person could have loads of problems and another have pretty smooth sailing. A few PCs ago I had endless trouble with the Stalker games on the other hand the last two PCs have been almost perfect (other than the actual in game bugs), only problem on the current PC is frame rate drops around certain fires but that can be solved with limiting the Flip Queue size (equivalent of Nvidia cards pre-render frame limit).

Guys, can you tell me how to mod the gog verson of stalkers?
the directory structure is different than the mod's..

thanks