So far I have only listened to disc 2, the Orlando show. Sonically, it sounds like they overused compression and EQ. The band sounds distorted at times and I hear the occasional click on the CD that sounds like clipping to me.
Elvis' voice is not that up front, and I suppose they got it as loud as they could (hence the heavy compression and EQ).
Good versions of It's Now Or Never, My Way (for which he does a reprise, as with Hurt, which is also a good listen. On Hurt the first time, at the end, he holds pretty much one straight note instead of his usual vocal acrobatics. Probably as you can hear a slight frog in his throat at the beginning of the note... but interesting to hear, as it was not what I was expecting.
So, in short, good show for the time, not the most listenable sound... maybe others will disagree.
Upon hearing disc 4 (Saginaw May 3), a balanced recording... Elvis opens with That's All Right (fades in with obvious tape damage sound), and seems not outstanding but not completely out of it. He's fairly present, but sounds tired.
As for the video, what little of it I have seen so far, some of it I have seen in better quality... looks like its been intentionally made to look old or this release. Perhaps we'll get a "resmastered" reissue in the future.