Here is a review with a guy that used M2 surrounds.
http://www.hometheatersound.com/equipment/axiom_m22v2_m2v2_vp150v2_ep500v2.htm"I’d originally planned to use M3 v2s for the surround channels, but Axiom’s Alan Lofft told me the M2 v2 would be a better choice because it is, technically, the M22 v2 with one fewer midrange driver. I’m glad I took his advice -- the result was an absolutely seamless soundstage. Ambient cues moved unimpeded from speaker to speaker, with no dropouts."
I should add that I setup my father-in law's theatre with M2 surrounds in a pretty big space (5000+ cubic ft.) and they performed very well after calibration.
