couple of friends use them for bikes, buggies, racing. about half have good luck with them. other half don't. Somes batteries didn't last and got new ones. Some have a hard time getting them to work. One uses them all the time when him and his 7 year old ride dirtbikes. A few really have them figured out and hooked to phone and if they have service and something breaks or needs something at the pit just calls. One has it hooked to regular pit radio to with an add on box but has a hard time getting his system to work. Seems it you take the time to learn and figure them all the way out and use them regular they work great.