As a long time fan, I had to go with a 7; the mix is very good but this is not their best work. We all love the old classics, but I have to say that the two albums done after Boom Dot Bust are really *much* better than Boom. More focused material that resonates through the absudrities if our daily lives in a similar way as the classic albums.
Don't know if they'll ever be released in surround, but Give Me Immortality or Give Me Death OR The Bride of Firesign are a total blast at least partly in the past. Familar references are used to great effect, great charactors, some of them you'll recognize.
Boom Dot Bust has some great moments but squanders the opportunity IMHO. Tornados are fun in 5.1 no question about that.
I can truthfully say I listened to the I Think We're All Bozos On This Bus Q8 tape 75-100 times. "How can we best illustrate the stubborn consistentcy of this eternal principle? By walking down this shady New England lane......." [are we off the air?]