Do your research as this can be glitchy / buggy / annoying.
- Battery life is only 1 day of real use if not using battery saver modes, and less if you use tracking.
- Google Assistant - you may need to set your phone language to English (USA) for it to work, which has other effects on your phone
- May not be able to obtain GPS lock on its own - it much prefers to use your phone's GPS location (edit: workaround to get this working in comments below)
- the heart rate may or may not sync with Google Fit after a recent update
Don't forget Cashrewards (10%) or Shopback (5.6%)