I'll check this one out. I just hope the album sound good. Metallica are notorious for crushing the music in the loudness wars.
Well to be fair, the only album of theirs that suffers from brickwalling is Death Magnetic (but is WAS crushed so badly that it became the poster child for bad mastering related to loudness wars).
Black Album, Load, Reload, and Garage Inc. are are some of the best-sounding hard rock/metal records ever, though, so I think it is stretch to say they are notorious for it.
Also, the version of Death Magnetic on iTunes is a new master with no clipping-induced distortion and reportedly sounds MUCH better than the original CD release (I cannot personally verify as I don't do iTunes), but enough people at the Steve Hoffman forum and the Metallica forum have confirmed that I am inclined to believe it.