Seems to be fine,
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This review is from: Withings Smart Blood Pressure Monitor (for iPhone, iPad and iPod touch) (Personal Care)
Doctor said that I possibly have high blood pressure but I'm pretty sure I was suffering from clinic apprehension which was causing the reading to be higher that what it was (I'm not saying it shouldn't be lower!). So to get an idea for myself I got the Withings BP monitor. I know that I could have got a cheaper non- connected model or even the Bluetooth version of the Withings but the connected one was fine for me.
It works fine with my iPad3 using the connector as is and it also works with my iPhone 5S when using the lightning adapter.
Using the device is pretty easy. Wrap it around your arm, open you iPad/iPhone, plug the BP monitor into your iPad/iPhone and the app opens up and then press start. The process is automatic and afterwards you get your reading.
To be it looks well made and modern - not like some of the cheaper BP monitors I have had. With it being connected to your iPhone/iPad you cannot change the readings (as far as I can see) so if you need to show your doctor the results they know you haven't been cheating. Also, with them being logged you can then view them on your PC or any other device you have the app installed on.
At this time I have given it five stars as does what it says and is easy to use. The only negative was that the supplied batteries were pre-installed and were DOA which meant putting some new ones in. That isn't a big deal except the four AAAs it came with were just thrown away which is a waste.