Still waiting for mine (though I am aware it is on the way) but my Game Master's Guide replacement showed up today....wahoo!
The binding of the US prints is much better. I also like that the GM Guide is in the soft cover format now; Really, if I learned one thing from the last eight years of the hobby, it is that I am sick of hard cover books for every little sourcebook.
Well, I'm going to go enjoy reading my replacement copy now...no more suffling through my sheave of broken books...hallelujah!