App works great, headphones have excellent sound. Use this with the Elite 300 (thought 700s were too bulky for my taste). Just an FYI, this does not work with the regular 300 or 700 series, only the Elites. You also have to download the update from JBL to get the full functionality of the app. Google "Elite 300 or 700 firmware update" and you should be able to easily find it. If you cant operate the software (unzip the file, etc) you wont get much help from tech support on that, sorry.
The EQ is awesome and has 3 sliders for each of mid, bass, and treble categories at different HZ so you can really customize the sound to your liking.
The only reason I rated it 4 stars is that every time you disconnect, you have to go back in the app to select your custom EQ again which can be annoying. Wish it would just save your selected EQ.
Sagadgreat about JBL Headphones