Box doesn't have original covers, just small replicas, doesn't have the original liner notes. But it has a new booklet and an extra disc of live material that was otherwise unavailable on it's own. I hear the sound of that extra disc is not the greatest.
Box should cost $40-50.
I'd buy 1-2 of his discs[sky Piece and Menagerie Dreams are awesome, especially the Sky Piece, which is an amazing cd, Al is right!], and then, if still interested go for the rest.
Or just buy the box.