Ive used the ECG Check iPhone case and app for almost a year, and its been a life changer. My whole life Ive had an atypical heart arrhythmia that hit randomly causing weakness and anxiety. My cardiologist wanted to imbed a device in my chest to try to catch and record the episodes but I suggested using the case and app instead. I started recording episodes and emailing them to my doctor, then alerting him with a text or call, as they were happening. Based on the recordings, he was able to narrow down the type of arrhythmia to one that is not life threatening and Im now on medication to control it. I still record episodes, now less frequent, and email them to my doctor. Even though Ive upgraded to an iPhone 6+, I can still do this as long as the old case is near. The case and app has worked flawlessly through battery changes and app updates. This has totally changed my life!