This was a replacement purchase from when my last one was stolen. 
 
I have been using this in small pubs, clubs and a few larger venues and festivals and never had an issue with signal or sound quality. 
 
I have mine in a rack with my bass amp. 
 
Features I really like: 
 
- The transmitter will search for the best channel & frequency to use and then it will transmit that to the receiver via infrared, ensuring the best signal every time. 
 
-You can switch from Stereo to mono and have two different signals, one to each ear, with volume and balance controls on the body pack. 
 
-Reliability and sound quality. 
 
One point that has caused me minor issues with sound engineers is that the inputs all take 1/4" jacks not XLR, but it just means I carry LXR to jack cables, a small price, which seems to have been done to reduce the receiver unit size as it has 2 input and 2 pass through in/outputs. 
 
All in all a great product, not the cheapest, but I have tried the cheaper units and have found them unusable.