With regard to the device using the app and the pairing with the iPhone I had no problems. The steps in the iOS app are very clear and the scale was set up and connected within 2 min.
All body values (fat, muscle mass, water content, BMI) are clearly displayed in the app. Without App, the scale is only a pure balance without additional values.
The only drawback is the lack of balance export to Apple Health Center. To this end, I have requested from the manufacturer. It is currently working on a new app which should appear in the 1st quarter of 2015. This app should be on redesigned from the ground and thus bieten- even better export function