Put me in the letdown camp.
This isn't my favorite Renaissance album to begin with (that would be
A Song For All Seasons), but I enjoyed getting reacquainted with it, just the same, and I'm looking forward to hearing the famous "Academy of Music" show. The liner notes don't add much to the package, sadly--heavy on banal facts and anodyne quotes. The whole package is a decent enough value, though; the price came down to $32 by the time it shipped.
Fidelity is fine, and it's nice to have everything in high-res, but as with so much orchestral prog of the day, the sound is really "wet" (see below).
The surround mix is the real disappointment. As people have said: if we'd known ahead of time that half the tracks were upmixes, then maybe expectations wouldn't have been so high. And if the upmixes were better, we'd probably be more forgiving. But as
Ryan pointed out, two of the three upmixes are effectively double-stereo. While the genuine surround tracks are better, IMO they're workmanlike though not especially subtle or creative, plus the rear channels are awash in reverb of Haslam's vocals. (Granted, the original stereo mix is heavy on reverb, too. Still.) All six tracks are opened up a bit in 5.1. On the whole, though, after three listens and a half-hour's worth of A-B comparison, I'm not sure I don't ultimately prefer the high-res 2.0 played back in "all-channel stereo." 7-8-7 = 7.