Reply to Snow - melodic 2-stepish track

Thought I'd share my latest creation with you guys. This is by far the longest time I've taken to complete a song - it's been lurking around my hard-drive for about a yeah and a half now, going through various forms, and it's finally in a state that I'm happy with. I'm planning on having this on my debut demo/EP along with a few more dubstep influenced tracks I have in the pipeline. Mastering aside it's pretty much finished, but I'm still looking for any constructive criticism before I call it done, so please let me know what you believe.

http://soundcloud.com/lost-cosmonaut/snowl