I gotta say, a friend forced me into watch this one, I didn't really care but when I saw that sick animation I just fell in love with it. The art-style is kinda odd at first, but then you get use to it you kinda start diggin' it. The plot development is just amazing, there even are a couple hardcore plot twists. The fight scenes are super awesome and hilarious at times and the music is just... It's so good that you just end up losing your way (See what I did there?).
If you love good action and good plot, KLK is your anime.