Reply to My first original track (Drum & Bass)

Actually 2 tracks, as I have this:

http://soundcloud.com/mwagner77/m-wagner-atomic-playboy

which is the original version of my first ever track.

And this:

http://soundcloud.com/mwagner77/m-wagner-atomic-playboy-vip

the (in my opinion), much improved rework of the track.

Both done in Ableton, with the second version also using Massive for the synth line. while, I'm proud of how they turned out, I'm also well aware of how much I don't know about production, so constructive criticism is more than welcome.

thanks!