I am currently using M60's, the VP150 and a set of direct radiating M22's as rears...I live in a rent house and did not want to have to hang the QS8's and leave a huge bunch of holes.
The M22's as rears are exceptional...albeit not as exceptional as the QS8's but are very expansive in the soundstage they throw. They continue to amaze me whenever I watch any movie. We do plan on getting the QS8's in the future when we move into our own house. The M22's will then be relegated to use with multi-channel DVD-A and SACD playback.
You really cannot go wrong in either direction. Find someone close who has Axiom's and give them a listen. Your wallet will thank you.
My .02,
WhatFurrer
