We had a set and used it a few times. Often it wouldn't work (too much steel or whatever) Yes, we had the ones with subchannels etc. The few times it did work well was fine, but it was something we could live without. Also we had two cabins, and one charger, so there were times the battery was dead on one or the other. Kind of a hassle, actually. We have one now so I would probably take it along. Would not buy one again though.