I agree smart scales have a massive margin of error for BMI, muscle weight, water %, etc.. That said, they are useful when used on a daily basis over many mont

I agree smart scales have a massive margin of error for BMI, muscle weight, water %, etc.. That said, they are useful when used on a daily basis over many months. Clear trends show up accurately (I started using a Withings scale 8 months ago and have lost 30lbs in that period, no single measurement is useful and they often swing wildly up and down, but the trend lines over time are what I found valuable, and as accurate as needed, at least for my purposes)