I bought this to increase the convenience level of my Ety ER4XR. I have previously used (and abused) extensively the Samsung HS3000. What I wanted for my Eties was something like the HS3000, but with more power. The device I received exceeded all expectations. The app is pretty good. It provides many customizable options, while allowing many to be turned off for those who prefer to keep things simple. It's not without bugs, but I haven't encountered anything serious. The Ambient Sound feature is interesting, pumping ambient sound into the...