I have installed this unit in a number of fitness clubs of late. The product is an update of the older units, and as such, has a few important features that send it well above the performance of the previous product. Having the rechargable headset mic removes the loss of the battery compartment door, and having to search for a fresh battery all the time. The flexible boom arm of the mic is a big improvement over the former model, and the mic sounds better. Changing frequencies and 'linking' the transmitter to the receiver has been much improved as well. The only criticism I can offer is that the connection between the headset and the charger cable is trying to be somewhat like the Macbook's magnetic, but is not as strong, and can be easily jostled loose, so attention must be paid to how the headset 'sits' when attached to the charger.