I want to know if people have had success with recording vocals with it. If not i'll have to get a new vocal mic, but i'm hoping the 57 will do a good job.
I use an SM-57 for vocals... seems to work good. Although ppl are right about popping. So build ur own pop-shield using a pair of tights and a metal wire coat-hanger. I did.
If you are working with a budget preamp, you may get better results with a cheap condenser, especially if your room is treated. If you get into a nicer preamp with enough gain to push a 57, I think it is great on vocals with a pop screen. I am running mine through an FMR Audio RNP and I like the 57 on my voice better than these mics that I have rented to compare:
Studio Projects C1
Shure SM7b
Sennsheiser 421
Shure KSM27
Shure KSM32
Rode NT1a (owned, but recently sold)
I finally quit worrying over why more expensive mics didn't sound better and just accepted the fact that on my voice, the 57 is as far as I need to look. It may or may not be right for your voice though.
And you're right about how important what the 57's are listening to is - it's gotta be good, no matter what. Period. Everything else is secondary to the performance. So, use the 57 as a measuring stick. You've heard a 57 every day if you listen to the radio. The rest, after buying the 57, cable, preamp and recording hardware/software, is up to you.