Battery life was really good, GPS tracking was great, everything was good, also synced with Strava. But what really killed me was that the heart rate was struggling to keep up. I ran for 10 minutes before it got close to my higher heart rate. then for some weird reason it would drop off from time to time even when my heart rate was high. I ended up buying the Amazfit GTR 2e for a lot less, with more features and a nice amoled screen.