Sound quality with the Eko is excellent and able to auscultate heart, lung, abdominal sounds well. EKG tracing is a great feature, though lot of artifact on the tracing (EKG and phonogram) and I don't find the quality to be as good as my Kardia (Alivecor) tracings. Hopefully, some of this can be addressed with updates to the software. My only other complaint is that the head is quite bulky and sometimes awkward to apply to the patient's chest. That all said, I do not regret my purchase and am happy to retire out my Littman 3200 electronic stethoscope... Eko sounds much clearer.