The RE-20 is excellent for almost *any* vocal recording for that matter. Most definitely the first choice for agressive male vox, but usually my "go to" mic for nearly vocal performance. And the SM-7 is in the same league - Although with it's "ribbon-like" demands on input gain, I tend to shy away from it unless it's a *really* aggressive vocal - Of course, most rap would fit right into that category...
I have no idea where this B.S. of "use a condenser" or "you *need* to use a condesner" comes from. Probably 90% of the greatest vocal takes ever were recorded through dynamics (including ribbons).
Personally, I chalk it up to ignorance mixed with marketing hype...
But seriously - If you're looking for a great, GREAT vocal mic - CHEAP, I might add - that's flexible enough to be used on nearly anything you put in front of it (as mentioned - guitar, bass, drums, brass, etc.) look no further than the RE-20.
Save the condensers for the quiet, female, "smoky jazz" vox, woodwinds, strings and drum OH's.
"Best not to use them for vocals in the studio" - Bah! Where do you get this from? You've obviously never worked in a studio if you think that's true for a nanosecond.
Honestly - I don't mean to sound unhinged, but there are two of the biggest "bunch of crap" myths out there that I just can't stand -
(1) Record your tracks as hot as you can without clipping.
(2) You need a condenser on vocals.
Utter garbage. Can't even imagine where it comes from.
Of course he needs a condenser mic, the dynamic mics are for stage use and while they can be used in a studio, it is best not to, especially for vocals.
Almost makes my blood boil... Complete and total ignorance stated as fact. There is more wrong with that one sentence than I could possibly explain.