How much concern about feedback/ambient noise when using the 635a omni
should I have when playing in a small club or bar?

Am looking forward to starting a band, that'll include electric
guitar, bass,
drums, and keys (piano/organ). And blues harp when I improve
eventually g.
Out of various microphones at home, this one seems to sound the best
on me.

It enhances a more authentic "bluesy" tone out of an otherwise melodic
voice, more than say a SM57 or RE15 (at least so far). I know that the
635a should be
"eaten" close up at any rate.

Also wasn't the EV 635a used live on harmonica by a number of blues
artists?

Am planning to use it "direct into the PA" vs. Chicago style amplified
blues harp BTW.

Thanks in advance,
Chris