Yep, that Iron Maiden song on MAYH is quite good...though, I have not heard it in its original format.
Generally, I wish they had not included the demos/extra songs on the re-releases...they should have stayed true to the original look with enhanced sound or whatever they do....just my opinion on the matter.
Now, just a thought; which has the better look? The Morningrise cover of the rerelease (with the band's logo on it) or the original cover without the logo? Personally, I don't mind either way (their logo actually adds a nice touch, which I wonder why they had not included it in the first place) but the original had better quality - the re-release, when I took a look at it at HMV, seemed somewhat pixelated. That kinda sucked...even the song titles at the back were a tad bit jagged - quite unfortunate, really....