You can read through this post on my thoughts about QSx vs M22s as surrounds, but the short version is as follows:
QSx great for movies (obviously) and nice for subtle echoes for music, pulls instruments to left and right of front stage very effectively.
M22s ok for movies and CAN be great for music (placement is a huge issue but are obviously more immersive for something like surround sound music)

"Those who preach the myths of audio are ignorant of truth."