Reviewed by me (Pediatrician) and my friend (Cardiologist). Pros: -Size and appearance, portability -Good heart sound acoustics when using headphones. Cons: -Lack of adequate sound volume through Bluetooth app -Inability to use device with Bluetooth speaker without App open -placement of on /off power button is easily pressed when placing electrodes on chest which shuts off device accidentally. -placement of ECG electrodes varies in individuals to find the best ECG connection -P waves difficult to find unless electrodes are on perfect spot of chest and no body hair is present. Without visible P waves. device cannot rule out A Fib. I hope that these comments are helpful to you. Best Regards.