Are budget trackers like the Amazfit Bip 6 or Xiaomi Band 10 accurate enough for serious training?

For step counting, heart rate at rest, and sleep, mainstream reviewers and specialist subreddits say yes — both punch above their price. For GPS-based running, the picture is mixed: r/miband threads flag dropped GPS on iOS with the Band 10, while the Amazfit Bip 6 gets more consistent praise for its built-in GPS and offline maps at $80. Serious runners may still prefer a dedicated Garmin.