Rob's just given me the go ahead to disclose that I was involved in the play testing for the surround mix of "The 27 Club" - i.e. the "good authority" I mentioned was in fact myself!
I've been a Magenta fan for many years and imho it's the best thing they have done by quite a margin. The surround is also up there with the best Rob has done - superb use of all channels. The version I tested was DTS 48k, which sounded incredible, though I'm pretty sure that the disc will have at least DTS HD 24/96k. Not 100% sure about other formats though.
The material is closer to Metamorphosis than Kompendium. Very much '70s Prog with loads of keyboards, layers of textures, some amazing guitar work from Chris Fry and lots of Magenta's "trademark" layered vocals, which are tastefully and very effectively panned in the surround field. I'll do a full review in a few days time, but for now rest assured that it's a real gem.