I had one that as long as you measured at the same time everyday (usually morning after urination before drinking any water) and it was consistent to itself. We got a new one which is not even that (an Omron so maybe stay away from those). These things are notoriously inaccurate and can be off by a couple percentage points. However, if it is consistent it's not a bad way to make sure you are trending down. While the tank method is most accurate, they aren't convenient. The cheapest most convenient are probably body calipers and taping yourself. And of course the mirror test. Body fat percentage is not the be all end all since it's ultimately how you look that matters. Some people will look more shredded at higher percentages. BF can just be another metric like the scale to make sure you are meeting or trending towards your goals. So my suggestion get one but don't spend to much money on one.