Interesting that this device requires a monthly subscription fee. I'm very curious to see what level of success this achieves. Being able to track body fat perc

Interesting that this device requires a monthly subscription fee. I'm very curious to see what level of success this achieves. Being able to track body fat percentage more accurately than smart scales seems like an amazing feature. Does any other wearable do this? My guess is the monthly subscription will be a massive barrier for most people, but kudos to Amazon for trying something different.