Ever since I was aware of wireless systems, as opposed to regular instrument cables, I have been curious of their quality, convenience factor, and the cons of going wireless. Do these things ever crap out in the middle of a gig? Is there a delay? If another band member onstage has one too, do they ever interfere? Why are they do expensive? And most importantly, unless you're Steve Harris, who really needs one? I would appreciate any input on this subject because this is pretty virgin territory to me!