We have been using one for about a month now. Been tested in water, getting rough with hogs, going through fences, etc... No complaints here, been marking the truck, tied hogs, hot areas, etc... Pretty handy device. Now with that said, we only run the unit on a collar (harness hasnt held up well in our thick stuff) . Short antenna of course, only things we have noticed that could be changed is after about 1 1/2 to 2 miles we are out of range. Also it always shows the dog has tree'd a quarry since the antenna hangs upsidedown. Again no major problems, you just go to where your dog was last tracked and keep trucking. Dont get me wrong I still rely on the tracking collars and run them every trip, but Tony's Garmin has come in very handy. Especially on a "new" dog or young dog you want to keep an "eye" on.
