An early adopter, worked great
An early adopter, worked great day one, have 5 acres surrounded by woods. Put the boundary right before tree line and we trained our border collie/australian cattle dog/german shepard - who loves to run and herd deer, rabbits and squirrels - to respond to the first warning on vibrate. She now will go full speed to chase to the tree line and pull up, run the perimeter and then give up the chase. Occasional early update issues and sometimes resets required in the first 6 months. Then after a year, quit taking a charge, did a warranty claim, sent it back, received a new Halo 2 in about 3 days. Works great, most early day issues gone with latest sw updates. Love it, free roaming pet with constant management and location available - fantastic!