I bought a Marco Polo recently. Although I haven't yet had a chance to fly since I got it, we did do some testing by one of us hiding it out in a remote spot. Then it was up to the other one of us to find it. It was amazing. Walked right up to it as if we were the one who hid it. For great piece of mind, I won't fly without it again. Be sure to specify the custom “23-gram, large battery RC Tag” which gets you the RC antenna for longer range, plus the longer life battery from the pet model. Tim, the president of the company was incredibly responsive to my numerous questions before purchase. Fortunately, I'm not recommending this based on personal experience with a fly-away. But my research and testing gives me great confidence that this is the right choice for me, since I often fly in remote, wooded areas, where depending on cell or GPS signals would be useless. The Marco Polo requires neither.