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I have a withings steel HR Sport (but the steel series are all the same tech). It's nice as a smartwatch to discretly read notifications, but I wouldn't recommend it as a sleep tracker. It's reasonable comfortable to wear at night (like a watch), but the actual sleep tracking is lacking. Often the last few hours get updated after I already woke up and picked up my phone. Also the sleep-cycle alarm always goes of at the earliest possible time for me and I can't figure out if thats the problem with the sync mentioned above or if I'm just always in light sleep at that time.

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