I had a craptacular Nady unit back in the ancient days when dinosaurs ruled the Earth and I actually got to gig. I don't think mine was typical of their usual quality, or the company would have disappeared into bankruptcy long ago.
If the company HAS gone bankrupt, them I claim no credit. But there were a few times I cursed them back in the early 90's. I would be wandering the club between verses, trying to work the crowd up...and my bass would drop out randomly, or I would pick up a Mexican radio station. (Once that happened while we were playing 'Mexican Radio' as a request. The guy came back up and tipped us extra for the special effects.)
I am considering getting a small modern wireless. I figure the technology has to have come a long way since I sold mine in 1993. At the folk festival I attend, I am forced to play guitar, because all my basses are electric and I have not yet found a good enough ABG.
This year a guy came with a Tacoma Thunderchief...and a stealth amplifier.

He had put a UPS battery, a car power amp and a converter in a soft-side ice chest with a small speaker and a wireless unit. When he wanted to be really stealthy, he would put a couple of beers in there as well. Nobody picked up on it till the last day of the festival when he cranked it up too much to be believable.Until then, everybody kept saying "That Tacoma really projects well. It's almost as loud as an upright."
I want to build a stealth amp like that. So I will need a decent quality, small, wireless unit.