IMO, the one overriding reason that the set can be "worth it" is for the 3 old-school documentaries on Disc 9. The prices on the secondary market for legit versions of "The Making of Star Wars", "SP FX: The Empire Strikes Back", and especially for the Japan-only "Classic Creatures" LD together rival the cost of the BD set.
Yes, I know that almost everyone on this site has at least on LD-to-DVD transferred version of each of the documentaries (Rowman's for me) but to have a proper release is nice in itself.