Have the WS-30 model (weight only) and have been looking for this model to drop for a while. Thanks to PriceHipster.
Maintaining a healthy weight is essential to a healthy lifestyle. Keep track of yours with the Withings Body Composition WiFi Scale. Featuring wireless sync technology, this electronic scale automatically uploads statistics over WiFi or through a Bluetooth-enabled smart device.
Key Features
With its patented Position Control technology, the Withings Body Composition WIFi Scale measures your weight and BMI accurately.
To help you maintain an optimal body composition, the Withings WIFi Scale tracks total body fat, water percentage, and bone and muscle mass.
Integrated with an on-screen local weather forecast, this body composition scale lets you plan your activities and wardrobe ahead.
When paired with its Health Mate app tracking feature or the Withings activity tracker, this body composition weighing scale provides on-screen counts of the steps you've taken from the previous day.
For multi-user convenience, the Withings Body Composition Scale has an independent sync feature which recognises and records stats from up to 8 users.
I think that was something the manufacturer's lawyers wanted them to put in just in case, because it'd be too expensive for manufacturers to test their products with all the different pacemaker brands out there.
I'm guessing the main target market for scales like these probably won't be using pacemakers, so it's not worth the manufacturer's time and money to do large-scale testing.
A small study back in 2012 found no evidence of interference.