I have used it at 1h live K4 recording of a queuer and I din't think i needed to use the backup recording at a iPad with Röde xy mic at the first editing of the event. This was the first field test. I have tested other small unit that fit at the top of the Panasonic GH3 camera and they "color" the sound in a way that you need a backup recording. This unit don't do it, as i can hear, but when it come to music sound that is not my high level speciality. With this unit at your GH4, you can make nice recording in the street at high broadcast level. The wind shield in the package is perfect, and the extended cable, make it fit into the reporting situation.