On solo day I just unplug the cord and hand my TX to the student and let them use the trainer until they get there own plane and gear. No rush to run out and buy. So far I have only lost one trainer so I guess my system works. Because my radio is so old not one student has ever gotten the same make or model I have. Most of the new radio gear on the market is outstanding but some of it like the Spektrum gear I haven't kept up on so when a student has a problem I just send them over to one of the other guys that uses that brand. Most the bigger clubs even have the trainer plane and buddy box on hand so there should never be a rush to go out and buy anythng until after the big day.