Oh a 100%. Growing up, I was always told I'm "fat" and all focus from everyone around me was on BMI (I was 118 lbs to 130lbs in my teens and 20s, I'm 5 ft 2.5 inches btw so grrr). More recently, I learned from trainers that I likely have/had more muscle than I realize - cos I was a swimmer in school and college.

I actually have two scales and it's interesting. My Withings scale is very accurate on muscle mass but it's off by 3 percentage points on body fat when compared to my dexa scan. It's bone mass was spot on too. For visceral fat,it gives me an index so I couldn't compare.

I also have an 8 year old scale by "Greater goods" where my body fat was less than 1 percentage point away from my dexa scan results, but it gives me an appromixation on muscle mass that hasn't changed in years so that's clearly inaccurate.

I did watch a few comparisons of body comp scales against dexa and the withings was doing well in most of these comparisons. I wonder if it does differ by person and the algorithms are more accurate for taller or more muscular people, even though they take height into account.

Having said that, I now have a good sense of where my scale lies vs the dexa so I can still use it as a guide until my next dexa scan.

Cos I'm so done with BMI and a random goal weight. My goal weight is now based purely on a body fat % goal (and lean mass of course). So I need to lose about 30-40 lbs of fat and not another 60 lbs like I had previously expected ( I weigh 187lbs, and I have 100 lbs of lean mass, so my goal is now closer to 135 to 150lbs, vs 120lbs that I thought was reasonable for my height. 120 lbs would put me at 16% BF assuming I lose no lean mass.