u3shaders is a pack of shaders for S.T.A.L.K.E.R. SoC. They are based on CoP shaders, quite heavily modified to work properly in SoC.
The concept behind these shaders is great: bringing modified CoP shaders to SoC. Unfortunately while some things do look better I noticed many issues with things like shadows on characters being a bit too much. It almost makes them look rotoscoped :/
There are also issues with the SSAO. Although Meltac's shaders also have an issue with the SSAO looking funny at times, overall it looks much better and has far fewer errors.
At the present time I can't find a reason to use this over Meltac's shaders, even though I do appreciate all the hard work this author has put into his shaders. The concept is good, but it looks as though CoP shaders were never really meant for SoC as it simply doesn't end up working out well.