This is one mic I've never had the pleasure of using as of yet. I do realize they are noise cancelling mic's......are these mic's anything like the Astatic 575 M6's ? .......they do have the same look . As of the last few years after using a 575 M6 for many many years ,I have become a Turner Telex Road King 56 kind of guy.....in my case, that has to do with my radio tuning and I've come to appreciate echo boards (set just right) and no back ground modulation as IM rolling down the road (-: ....The RK-56 is truly a fine non-amplified microphone. (not to be confused with any of those CDL knock offs,they don't come close or have the drive of the RK's as far as IM concerned) Just was looking for some opinions on those Road Devils and there performance. Thanks Switch Kit