Some weapons that were introduced in the last update (cosmetic) feature different kinds of weapon skins, all really neat, in my opinion.
Some of the qualities range from Field-Tested, Battle Scarred, Factory New, Minimal Wear, even to Well-Worn.
Question is, do these affect gameplay? I'm pretty "poor", so I don't really have money to just throw on keys, and I'd like to know whether or not it's just a cosmetic look, or gives a slight battlefield advantage?