I just picked up Rust In Peace remaster (Since my original kinda disappeared off the face of the earth. I'm sure its around SOMEWHERE)... and I can honestly say remixing and remastering it did it a world of good. Everything sounds fantastic, the guitars sound better, and the vocals have more bite to them. And the bonus tracks are quite interesting too. "My Creation" is good for only being less than 2 minutes, and the demos are worth checking out seeing how Chris Poland played on them.
Before I loved this album. Now its Godly.
It got me to get the "Peace Sells" and "So Far..." remasters. Definatly sound so much better (although the bonus tracks are pretty much just the originals). And yeah, the extended intro to "In My Darkest Hour", nice touch.