Others may differ on advice, but to me the whole point of the left/right surrounds is the surround effect. The Q's will envelope you in sound, whereas, a bookshelf or floorstanding speaker would be more direct radiating. Now, if you are going to listen to a lot of music in 7.1, DVD-A, or SACD, then m80's would make you go deaf. My room is 8,000 cubic feet. I don't use the whole room for HT applications but for music 2 m60's are fine.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85