I bought this with drooling anticipation (naturally) and to be honest I did feel slightly disappointed intially. I suppose because after William's previous efforts, this did not seem to have that Star Wars WALLOP I'd become accustomed to.
Fortunately, I WAS WRONG! This is, as I suggest, a real 'grower' and the themes just get better and better after each listen, so much so that this is just an addictive soundtrack that I rate right up there with the best. There are subtleties here among the more familiar themes (Williams relies on the Force Theme as well as Luke and Leia's Themes, and of course Vader's March) but tracks like the absolutely stunning Anakin's Betrayal flesh out the musical language of Episode III.
The new theme, Battle of the Heroes, is at first seemingly not as striking as Duel of the Fates, but listening to this and the album highlight Anakin Vs. Obi-Wan reminds you that Williams is a quiet genius at integrating themes of doom and tragedy for this final chapter even while he is injecting (a new) hope through familiar themes and weaving a totally masterful Star Wars listening experience. An absolute must-buy, rewarding you on many levels and after many listens. This demands, and deserves, your full attention.