Quality seems good. I should have researched more. Many of the biometrics are not live… they are on demand. So ecg/ekg is a 30 second process (sort of figured because you have to hold the crown), but blood oxygen and heart rate are also not live… which eliminates some of this watches usefulness. If I wear it to sleep I can’t track activities the next day because it needs to charge. All in all ok. But it needs a lot of work to be great. There are other/cheaper devices that can do what i was hoping this could.