I use these mics on stage for 2 years. And for students in my school song, I use them for a year.
The sound is excellent, the distances. The best part is the savings on batteries 1.5V batteries. The weak point is probably the frequencies that are limited only 4, but néanmonis effective.
Yes I worked with Beyer, Sennheiser ew300, shure pg, Samson and it's really the best value for money.
Of course this choice I do it again without hesitation. In fact I am considering buying the same system with two transmitter box guitar. I will try to tell you a little more.