shafi_22 Compared to my Garmin it loses around 20m per km. So a 10km run returns around 9.8km instead - not terrible, but room for a bit of improvement if you’re relying on it for accurate distance (which at the price point, I’m not sure many are). Anecdotally checking my HR during an activity it seems to be within 1-2bpm of my Garmin, which is excellent – although I have hade issues with HR never syncing to Strava, and 1 of my 4 tracked activities only recorded max and average HR in the Nothing X app (despite providing good in-the-moment HR readings during the activity) so still a few bugs around that need fixing, but based on previous bug fixes (or there lack of) it might just be something we need to live with. Watch is still more than adequate though for casual wear - enjoying it, just a few software issues stopping it being great!