Knives are awesome and really change how the game feels. I remember getting my first one and checking it out constantly during rounds. If you want to see all the different knife types and their skins, go here for a complete overview of what's available. There are so many cool designs and finishes to choose from. I started with a cheap knife and gradually upgraded to nicer ones as I played more. The animations and sound effects are different for each knife type too. Now I'm saving up for a butterfly knife because the animation looks really smooth