It sounds very appealing to me, at least as a B speaker kit. If you already have the kit, I see no reason why it would perform poorly with the QS8s, assuming it performs fine with your existing speakers. And at $100 a pop, it's pretty much a no brainer.
In general, I think I would prefer a solution with a line level input in addition to the speaker level, but for a surround setup, it might just work. Be sure to pay attention to the addendum at the end of the review off of the Rocketfish site--looks like there could be issues with regularly powered receivers as opposed to HTiBs.
Peter--see the title of the thread.
