We were in a live sound situation where we have a tremendous amount of outside RF interference. i.e. 2 TV stations, a 50K watt radio station, multiple cell towers, plus 450-470 towers. This unit stopped all the problems we were having.

This has a better sound than the SM58, but not as durable. You can't just buy this and plug it in any mixer, your mixer must have a phantom power, or this will not work. But totally a good sounding microphone.