I own all of U2's albums, and all of the remastered editions as well. While I love the beautiful booklets accompanying these re-issues, and they all sound good, I haven't noticed a HUGE amount of sound improvement. Not that I'm complaining, but "WAR" for instance, still sounds a little "shrill" (to my ears at least). "Unforgettable Fire" is the U2 album most noticeably improved with the new mastering. "A Sort Of Homecoming" has a nice "roundness" to the sound and mix which the previous CD release lacked. There are even "incidental noises" which can be heard now that I never noticed before on the previous edition. Things like the odd cable buzz etc. actually add to the CD. U2 were, after all, recording fairly "live" in a castle. These "imperfections" really take you right into the recording session. These noises, I should add, are really only at heard discreetly at the start of certain tracks. The sound is GREAT. I have absolutely no complaints with this disc.
On another note, I've always felt that "Unforgettable Fire" was sandwiched between two rather celebrated U2 efforts "War" and "The Joshua Tree". For this reason I've often felt it's somewhat overlooked in the catalogue. True, "Pride" was a big hit, but listening back to this album now I realize how much artistic "gold" I had overlooked. "Bad" is absolute classic U2, "MLK" is beautiful, and "Unforgettable Fire" is another haunting piece. Basically, I've been most impressed with this particular U2 reissue. I'm really glad such an important artistic milestone for the band has now been given a proper release on CD.