. I used to have a home scale that tried to electrically measure your body fat. It might as well have been a random number generator. It's more important to have a scale that's accurate and has big digits I can read without my glasses. (Whoever designed the "Thinner" model I'm now using had a strong case of iPhone minimalist design envy.)
I've got a set of Withings wifi scales. They've been an important part* of my 25kg+ weight loss since last August.
They weigh me, record the weight on Withing's service, provide me with a chart of my progress, give me some nice iOS apps and tweet my weight once a week
http://www.withings.com/en/utils/graph?u...forcedisplay=fm(apologies for the Flash)
* the more important part being finding that my body/brain enjoys fasting two days a week (where fasting == <800kCal a day)