This set can certainly be considered a definitive collection and representation of the magnificent John Williams. It is all well played and most of it is conducted with flair and a real understanding of this music.
It's the editing/mastering of this set that brings real concerns and real problems. Playback levels are all over the place. But I could live with that if that were the only problem. It's not. Worse, the mastering process subjects many tracks to severe manipulation, seemingly randomly and on-the-fly. For example, a track will start, and after a couple of notes the recorded volume is suddenly turned way up or down. Not at the beginning of the track, but while the music is playing! Also, the HDCD remastering is bizarrely and randomly applied. It varies from track to track (on for track 1, off for track 2 etc.) But worse, it is turned on and off at will throughout some tracks! (on for a few seconds, off for a few, on/off, on/off throughout while the music is playing.) And yes it is clearly audible - good grief! It's as if a little kid did the mastering and decided to mess it all up just for fun! It's that bizzare and random and amateurish and, frankly, inept. So all in all, a great collection of music completely ruined by inept editing and mastering.
Amazon, since you commissioned this set "exclusively" for you, you really ought to go back to whoever you paid to do it and demand some answers. We buyers are not pleased. And Silva Screen Records, you ought to be ashamed for your lack of quality control. And your Mastering tech on this set, listed as Rick Clark, needs to be fired.