A note before I give my review.  I haven't played Xenogears, or have heard much of the original track.  Heh I need to play that one of these days. 
This is by far one of my favorites on OC.  The intro was a bit random, but it was a nice touch to the overall effect of the piece.  Once the piece truely got started it took off, and it didnt stop at all.  I get goosebumps when I hear it .  I actually like the entire piece, and I don't see many flaws.  The ending is great I think.  The tempo just instantly drops, and then the music softly plays, which in my opinion is a nice touch .   
I give this one a 10 out of 10