I had high hopes when i ordered it, the concept of directly downloading single sounds etc is great ..... BUT i had a lot of trouble using it with Android devices (which is what i originally wanted to do), it was not connecting, not registering, not reliable after finally connecting .... disappointing. Works great with iOS devices, though, both iPhone and iPad, so i will have to use my iPad for it, although i did not intend to use it for that.
It has a button which you have to press to make it connect, and this is easily pressed when the unit is connected to a Jupiter X or Juno X, but i have a Jupiter Xm which has the USB socket deep under the top part of the back side, making it almost impossible to reach and press that button to start it when connected, even if you have small hands.
All in all, well built and does the job perfectly with iOS devices, but i was definitely disappointed with its poor connection to Android.