The 609/906 mics can't be beat for functionality. I love that they can fit anywhere and doesn't necessarily require a stand in most applications. But to me they sound *just alright.* They are very much hyper cardioid which is a blessing and a curse, depending on which amplifier it's sitting in front of. If anything they sound thin and wimpy to me. But on a loud, crowded stage I don't think anything beats 'em.
All the reviews I read say basically the same thing about the 609...too much top end and not enough beef.
I have also read that the sm57 and 609 are pretty indestinguishable from each other...but I don't buy it.