I've not used them myself, and haven't heard any field recordings, but I've seen some bands use 'em on stage. I believe Del McCoury uses one, or maybe they use the fixed card 4030. My bro used the 4050s for some studio work as well. Nice mics! But not positive how they'd perform for field recording. If they're upgrading and letting 'em go for a good price, worth checking out!