My high school band teacher had a pair of the NT3s for use with the sound system. I loved em. We used them as soloist mics (sometimes on the 4th of July float) and they never once feedbacked, even when pointing towards the speakers or getting blared into with my sax
. Also, I used them to record once in the gym and the recording came out pretty well, even with my inexperience at the time.
I thought I read something from Bruce Swedien saying he liked the NT4. Can't find where I read that though so I could be wrong.