It's catchy and cool and climactic. Smooth-flowing and well-structured. It progresses pretty quickly and is very well-varied, which I appreciate. Dubstep isn't my favorite genre, but this was really unique and groovy. You incorporated the sample well too. What I really like about this piece is that it evolves from an ominous and relaxed ambient style to a catchy, bass-y techno to some pretty intense dubstep. I love the variation and instruments. I'm looking forward to hearing more, L13S. Excellent work! :D