I have atrial fibrillation. I take beta blockers and see my doctor regularly. The last few months, my medication has not been working on and off. When I see my doctor, my ECGs have been okay. I started recording my ECGs at home on this app and too it to the doctor. He was amazed at the accuracy (he was the one who recommended this app).
I just got my new iphone 6 and waiting for the new attachment. I still keep my iPhone 5s to use with this app and attachment until they make the new one!
Reza 2014 about ECG Check