I work as a Professional Juggler, I move a lot on stage, and this has worked perfectly for me for the last 6 years. I use an Omnidirectional headset mic with it. In the 6 years I have replaced the headset mic a few times (due to normal wear and tear) but the transmitter and receiver as still good as new.
In that time it has never cut out, and always worked correctly.
Sound engineers in large theatres have been impressed with the sound quality.
I have never gone out of range, but have worked on stages 25m from the receiver and had no problems.
I live in Ireland have have never had any problems with interference.
I sometimes use a 12v power bank to power the receiver so I can work outdoors. This works great.
Fits perfectly in a Flyht Pro WP Safe Box 3