id use MS anywhere EXCEPT from far away from the soundsource.. and like teddy said, anywhere where blumlein is called for, but wouldnt work because of the situation behind on the other side (behind you) the soundsource.. I like MS alot when aptly used.. great staging..
teddy.. why did your friend add 10 db gain to the v3? there seems like plenty there for most mics and soundsources..