What is the opinions out there on this new technology like https://gagadget.com/en/66974-best-gps-trackers-for-dogs-review/ ?. Is the Alpha worth its price? Dogtra has their new pathfinder out there and it looks like sportdog has a new 2.0 model on there tracking system. I will be looking for a unit to do two dogs on and wanting to be able to track and trains with one system..