I use this system for 2 years on stage VHF and overall it does it well ... For the 400th one can still move around without tripping over that damn cable (well. ..)
Good for Feedback: You really have to point the microphone towards the back to make it parte pacifier, so it's cool on stage. The sound of the SM58 love me, and frankly it is well rendered by the RF system, do the test with an SM58 and SM58 HF wire ... Cloning!
Bad point for parasites: are two gain settings (3 with the knob on the front of the receiver) and yet my tests, there is a lot of noise ... Already good with laptops, some neon lights and especially the UHF Sennheiser (my guitarist's mouth to be shure) ... Shure not put Senn and next, they love it ... So it's "all Shure" or "something else". Otherwise, on stage it is better to place the receiver in front of the console, because if the receiver is behind the singer, the breath appears ...
I have not tried other models before buying (it was a cado) but if it again, I would try to test the Sennheiser EW - and I would try to see the difference Shure UHF system