I voted 9. Performance is excellent. The stereo and surround mixes are well done. Video is also very good, and works much better than Radical Action, IMO. In this video, you can clearly see how important Jeremy's contribution is to this band.
It could easily be a 10, but there's something that stopped me from saying: "hey, this is perfect!". I don't know whether it's Jeremy's drums, that were mixed in the rear speakers (exactly in the centre), or the vocals and Fripp's guitar which are too low in the mix, at times.
I have to confess that once I got used to the mix choices, I stopped thinking about having one of the three drummers coming from the rear speakers. It is strange though, especially in Indiscipline and other tracks where there's a pronounced dialogue and interaction among drummers. Vocals are a bit recessed at times, or it might be the echo (which is different in the stereo mix). Good to hear Mel moving from FL to the rear speakers, that's good.
Overall, I think the 5.1 mix works best in combination with the video. I've listened to it in audio-only mode, and doesn't work for me. I don't think the bonus tracks were mixed from multitracks. To me, they sound like soundboard recordings, but I am happy to be proved wrong. On this regard, I'm wondering how they came up with the 5.1 mixes for these bonus tracks... which don't sound particularly good. Performance-wise, they are excellent though. Discipline is great.
Other great tracks: Pictures of a City (I generally skip it, but this one is great), Fracture, Meltdown/Radical Action/Level 5, Neurotica, Sailor's tale, Schizoid Man, Indiscipline (the intro). This is a must-have for KC fans.
Note: all tracks are included in hi-res stereo and 5.1 on the blu-ray, which is great!