Poor

It is important to know that while Withings may charge you hundreds for their scales, they provide zero support. Since I have owned their smart scale, they have eliminated iPad support making it a lot harder to use. The app they replaced it with, this one, is full of bloat and bugs. For example, the step count it uses is incorrect and does not match the one in the health app. For the baby scale, they require you to configure it using an old pre-iOS 7 app that generates a warning on 64 bit devices. It likely wont work much longer rendering a very expensive scale nearly useless. Be very wary of this company.

chymotrpsin about Withings Baby Companion, v1.4