Just FYI, you need to make the division between the actual pieces in your ears and the tx/rx units that make them work. The transmitter would be the source of any lag. I use a Galaxy Audio tx/rx and the WAVS IEMs and my system works fine. A cheap tx/rx unit CAN work but your range will suffer. My Galaxy was only $200 and I can get 40 feet from the transmitter before it starts to cut out. Our guitar player has a Shure and he can go further. One time this year my battery went dead so I quickly took the cable from my receiver pack and plugged it into the transmitter's headphone jack. It got me through the set until I could change batteries. You didn't say if you have the tx/rx equipment and just need the ear pieces. If you don't, Santa may frown a little...