I like the instruments and chords at the beginning. It's catchy and unique. The transition at :56 was very good, and, although I usually don't like dubstep that much, I found this tolerable. I think your transitions at 1:23 and 2:17, however, need to be smoother, and it ends a little suddenly. Still, it has a lot going for it, even if it's not really my genre of choice. ;)