#3
would love to hear it with drums and bass, it would compliment the riffs a bit more, some of the riffage is a bit plain without it. some different chord progressions could mix it up a bit too, maybe bring back the clean bit at the start somewhere?
#4
Dude, i like it, the intro is pro, the only thing is the riff progression, could be changed a little bit...
I would love to hear this with a full band =)

Thanks for your feedback
"oh sh*t i gotta do vibrato"
-Marty Friedman

Best quote ever.