To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
The first watch was slow by more than 7 seconds per week. The replacement was inconsistent, but ended up losing over 3 minutes in the first week. I set and reset the watches according to the included instructions, so I'm not sure what I could be doing wrong. It's a shame, because the watch looks and feels great.