I got the orange Q8 in the mail in a few days ago. I gave it an 8. I have the CD-4 too, but it's one of those lousy Asylum pressings so I figured the tape was a better bet. Now I don't usually complain abut sonics, but this is one of those Q8s that really sounds like an 8-track.
The mix is really good, but as others pointed out above there are some minor issues with the vocal balance. On some tunes, the lead vocal sounds buried, and on "Already Gone" the backing vocals in the rears seem a bit too low. I made some adjustments on the PC after recording it in that I think improve it a lot.
There's also the weird mix on "Good Day In Hell" with the rear vocals. It's exactly like how the track "Space Truckin'" on the US CD-4 LP of Deep Purple's Machine Head also has the vocals completely through the rears, while they're upfront on every other song.
My favorite track for surround is actually the title cut. Great use of the rears for the trading vocals ("and we want to know...whose wing are you under?",etc). Man, I wish Rhino would get this and One Of These Nights out...