They sound fine to my ears, the range can drop SHARPLY depending on environmental interference, which means the 30+ foot range can quickly become 10 feet. Some of my store's customers think they're the bee's knees, others decide they can't handle the short range.
Not bad for the money, imo, but Samson (and a few other companies, I'm sure) has much more capable units for around thirty bucks more.
CP&W Bassist Club Member #371, Ibanez BTB Club #16, Headless Club #11, Fretworks! employee