I am using this from 3-4 months, accurate steps tracking and fine sleep quality track, it doesnt track speed during day , thats bit let down.
Good build quality.
Water proof, I use these even while taking bath.Nice waterproof
Scratchroof-In this 3-4 only minor scratches
Weight- Very lightweight , didnt feel sometimes in my hand
Battery life- 35-40 days battery
Video- https: //youtu.be/djICpyKjWk0