I've used 4 x QS8 v2 surrounds for music and movies with M80s for the last 11 years. I'm very happy with them. I'm getting ready to upgrade to QS10HP which I anticipate will give me a more immersive feel during movies and a wider and more linear soundstage for music. I've heard the QS8 with M3, M60, M22 and LFR and there is no tonal difference.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated