Yes, I bought 5 sets, because I thought it would be cool if the whole crew could talk, instead of just the climber and crane operator. I bought the best two-way radios I could find to go with them (Midlands, which were supposed to be compatible...) but I couldn't get the throat mics to work. I sent them back to Sherrill and they said that they worked for them on Motorola radios. My radios worked great with a regular earpiece, but the throat mics were useless - all I got was an occasional garbled transmission. Right now I'm working with Sherill to determine the exact nature of the problem - probably the mics work better with certain radios. I'll keep you posted so you dan't waste your tiome or money.