I've been using it for about 2 weeks now. It's ok, but there is room for improvement. It was delivered expeditiously without border hassles to my Canadian address. The box is quite nice, on par with Apple type products, and as such, I was a bit disappointed with the Eko itself. Solid, but a cheaper feeling plastic which would have been nicer had it been a rubberized or equivalent type of plastic, which could also facilitate better holding. The half-fist size of the device adds a notable and verge-of-unwieldiness length to my Cardiology III. In addition, it's heavy enough to change the weight of how it drapes around my neck between use; i.e. it pulls the scope down, necessitating frequent re-adjustments...glad I don't run with it. In this day of tiny transducers/amplifiers and ear pods, I'm surprised that the whole device is not more miniaturized and lightweight. I'm not thrilled by the big on/off button; there should be a more elegant on/off button/slider. Functionally, it certainly amplifies, but it reminds me of music playback of the pre-noise reduction era or a microphone without the foam covering. All noise from skin rubbing to hair crackling to finger adjustment is amplified. I have to change how I move the scope from one location to another...no dragging or bumping. Once set up, can I hear sounds louder and more clearly? Yes. And the volume is adjustable. The app is cute, but only marginally practical, as I wouldn't typically 'analyze' the sounds or sound wave or sound pattern for more than a few seconds. I suppose I'm just an old doc with an old stethoscope that facilitates >95% sounds that I need to hear within seconds. I do appreciate the ability to increase the volume to clarify some sounds. I'd be disappointed in myself if it really discovered sounds that I would not have been able to hear with some careful adjustment of ear piece, room quietness and focused intent. So, it's an ok addition to a spare stethoscope, and I appreciate the inexpensive pricing. And I guess that's pretty much the summary...you get what you pay for. I'm a lot more impressed with my $1200 dermascope with high quality finish, nice hand balance, compact size and a truly extended utility of clinical practice.