I bought the Pettracer after our cat went missing and was found shut in a neighbour's garage. Having the Pettracer gives us more peace of mind as we now know the range of the cat's daily adventures and we know we have a very good chance of finding him if something goes wrong. Setting up the device is a bit complicated but stick to the step by step instructions and you'll get there. The collar looks a bit cumbersome but it's lightweight and doesn't seem to bother the cat at all. We've had the Pettracer about 6 weeks. The collar got lost once. I don't understand how it came off the cat but it did give me the chance to try the radio tracking function for real and it did the trick.