Have been using DTR series radios for many years now (Motorola DTR410's to start) and they work extremely well. However, as others mentioned, many use them right out of the box, with defaulted settings. I have a barge crew operating in a river nearby that uses the first channel default settings, and it is probably a good thing that their range and capabilities are limited. Otherwise, great radios and very "secure" comms if you set up your own private channel.