Consumer Reports reviewed body fat scales a while back. They recommend anything by Tanita. They do caution that these scales tend to overestimate body fat percentage (I think the average overestimation was about 5% for women, 2% for men), but that they were accurate in measuring results over time (i.e. the actual body fat percent may be a little bit off, but the amount of body fat lost from one weigh-in to the next should be accurate).