In my experience, the only way to really utilize QSound is on a per instrument basis, or on a submix, to broaden say a group of guitars. With a full mix, there would be too many things that would get washy.
On my own album, I have a segment in which I'm building a thunderstorm, and had originally been applying QSound to that, to move it outside the music. I eventually did something else, and it worked much better, preserving the low end I wanted, while still giving me a wider than stereo image. On the Roger Waters CD, it would have been applied to things like the dog barking, to move it beyond the speakers. With the plugin, there are some nasty (to my ear at least) phase effects that can occur in the low mids, which while making the image wider, also add a hollowness to it. Processing ambience also works, but again, isn't necessarily better than using other techniques, such as delays, or phase tricks.
I won't claim to be an expert on QSound, but I couldn't justify the upgrade to keep it current with the rest of my system, which is a shame as I liked the idea of supporting a Canadian company.
As for locating a copy of The Swimmer, just look down.
