Im not a graphic guy, other than the tint changing it all looks the same to me.
If you use it you can turn it on/off while the games running by pressing the Scroll Lock key to see before/after. That link I posted a few posts up, a lot of the screenshots have a slider bar on them that allows you to see a comparison.
http://sfx.thelazy.net/games/screenshot/831/
If you use the slider on that screenie you can see the sharpening and it looks less foggy and washed out. You can do more than that if you want, just posting it as an example
Smooth.