Hm. I heard the 5.1 mix yesterday for the first time and my feelings are mixed as they was with CTTE.
Perhaps it is very difficult to do a good surround mix if there are too many channels on the mix and you do not have the chance of seperate track for all.
In my opinion Gates Of Delirium is not a surround flash experience.
Some Keyboards are too loud, some guitar works too silent.
I prefer the stereo version.
To Be Over has the best surround mix here. I really love this.
Sound Chaser is ok.
The XTC release has flashed me more.
An 8, because it is a Yes classic and the bonus content is also very nice.