I've bought this combo because I'm too poor to afford the professional sure stuff which I've been seeing on the big stages. It works great, I've used it on multiple ocasions, and the mikes were nicely conquering other wireless equipment.
I'm not shure if the frequencies of these things are legal in my country, but nobody questioned me anything so far..
It starts buzzin if there are more than 200 Eye Phones in between receiver and transmitter. I also can't remember when I changed the batteries in the mics.