It's no surprise that the Montenegro titles have good mixes, they were designed from the ground up to be played back in quad and I think it shows. Montenegro's association with RCA ended in 1975, the same year that they stopped putting out quad product - I don't think that's any coincidence.
I spoke with Mike Dutton from Vocalion via email and told him about QQ (and this thread) and the enthusiasm we have for mch SACD reissues of old quad masters. He said they were seeing a good response to their blog post so hopefully there will be more of these issues in the future. I also offered to lend my quad-knowledge (for whatever it's worth) if it would help get more titles released, and mentioned that the Sony quad catalog is equally as large as the RCA one, so they know it exists at least. Mr. Dutton said he had worked for several companies that released quad albums over the course of his career, and seems to have an excellent grasp of what constitutes a good release so I think these reissues are in good hands.
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Awesome post man!