Mark,
I don't have an indoor set of M3's but I
had a set of the Algonquins in Almond Bisque that I had to send back...wrong color.
I put them on top of my M60's in my greatroom and used them in place of them for a couple of days and was blown away...I set them to large to see how they would sound just by themselves without the sub. I was very impressed!
Know this was not exactly what you were looking for but as I did not have a set of the M3's previously, I was interested in hearing what these "outdoor" speakers sounded like "indoors".
I could see these also being used in a situation where SO input would like to have the speakers the same color as the walls...these could be painted to match any room and help them more "disappear"...
Waiting for my Cape Cod Grey set to get here...
Sound really great here.
My .02.
Regards,
WhatFurrer
