I am very impressed with the EGG Limited Edition Reprints of the AD&D 1E Dungeon Master's Guide and Monster Manual (my Player's Handbook is on backorder).
The books seem to be heavier than the originals. The paper used is of higher quality. I now have copies that don't have the combat tables soiled by my dirty fingers flipping through top find the charts time and time again.
Amazingly enough, my Monster Manual opened right up to the page with the Succubus on it. Good times :)