Withings Wi-Fi Body Scale: Track Your Body Weight on Your iPhone

Withings Wifi Body Scale
Withings Scale Pros:
Attractive device in the home
Capable of ongoing improvements in features through firmware updates
iPhone application for ease of monitoring your body weights over a time period
Capable of multiple users being tracked
Can be set for metric (kg) or English (lbs)
Very responsive to customer feedback

Cons:
Expensive