Xiaomi's original Mi Band was a catalyst for affordable fitness trackers. The lineup didn't even have a display intially (it got one in 2016 with the Mi Band 2), or a heart rate sensor - it was as barebones as they come. Now in its 9th generation, the Xiaomi Smart Band 9 has a 1200-nit display with Always-On functionality, a quality heart rate sensor (which Xiaomi says is 16% more accurate than in version 8), and a new linear vibration motor for better haptics. Compared to series 8, the new band has a bigger battery, and a brighter display. What's missing? Built-in GPS. For that, you'd...
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