Excellent! Bought one for each of our dogs and it’s been great fun and practical and informative. One of our dogs is 6years old and the other 18months.... and it’s helped adjust how much crazy running the oldest one does with the puppy as he sometimes gets stiff and maybe has a little arthritis.... so seeing how many km he does helps me monitor this and adjust walks accordingly for him, and to suit both of their needs. It’s fun to see what she does e.g three times the distance of older dog... even though they are on the same walk. And how does she do 5k Just wandering around the house in a few hours .... I knew she was always on the go!!!!