I use a combination of QS8's for the sides and M2's for the rears in my 7.1 set-up. I find they sound just fine together and couldn't tell you which speaker I prefer as a sourround, although when I do finally upgrade my entire system in--hopefully--5 years, I'll probably go with all QS8's. But with luck Axiom will have something bigger by then like QS10's to match my M80's and VP160.

"Not throwing my hands up or my dress above my ears don't mean I ain't awestruck." Al Swearengen