I've got the same setup... you can notice a difference between 5.1 & 7.1 but is it worth the cost? Probably not. However, if you are like me you won't feel satisfied until you get the 7.1 Plus one day they will be truly awesome in the dedicated screening room right?
Its not fair to say that they are not beneficial. What you should say is that the Qs8s are sooooo good in the 5.1 configuration that there is little room for improvement in the 7.1 configuration. But it is really cool to hear all of the speakers work in concert when tie-fighters sonically emerge from back left to front right. Just don't expect a dramitc improvement. There isn't room for it.
Neb
