We used ours two trips ago, and they really didn't work at all (we didn't have roaming on the cells). The kids can go all over the neighborhood or out in the woods behind our house and we can still get them on the radios, but in DW there is too much interference. We had to nearly be standing next to each other to come in with a clear signal. The only time we ever used them effectively was when I was trying to call my Dad; I had tried repeatedly, but it did not work until I could literally see him. It did keep me from calling out over a bunch of people. Last trip we used cells, so much better!