I had a pair of M3s on 30 day trial, but unfortunately they did not like the little room they were put in. I also ordered them in a color that didn't go well with my decor (or compliment the shape of the M3s).
However, 2x6 and I compared them directly to my M60s and his smaller Michauras. The M3s fared very well - amazingly well for the size room in which we were listening. They're really good little speakers.
IMO, if you're getting M3s for a stand alone stereo system you should order them in a dark color to de-emphasize the steep angle at which the sides withdraw.
And, if you can afford it, do a high gloss finish. The little buggers deserve some nice clothes!
