I use it for 2 years.
Ideal for vocal and speech, it is convenient for novices because the SM58 does not require perfect positioning of the microphone from the mouth (even when it is recommended).

I chose this system because it a good quality of rception, even after the port compared to another brand and it does not easily dcroche.
For an effect of feedback you really put the mic lenceinte.
In the UHF range is a good qualitprix (but + quality.
I acquired several dj Shure UHF system.

Point "-" I recommend a 9v battery for a night not to have a surprise.