Am very satisfied with the device. The handling is great. A small detail that I use often, is the ability to turn off the display by pressing a button quite what is very handy at night.
With my iPhone 5S and iPod Nano there is absolutely no connection problems via USB. Ranstecken goes. Using Bluetooth I have it only as a proof-of-concept attempts time and that went well; but I prefer the USB version. Incoming calls are shown on the display during music playback. The speakerphone I have not tested, but it's a lanages cable with microphone here, which you could install in the steering wheel area.
Very handy, I also think the AUX input. In addition to the Lightning cable now is also a jack in the glove compartment, just in case a non-Apple users should ride and has great music.
The only negative thing with: The Volume +/- and +/- buttons below the display track are not found clearly blind, so it is not a mark as a tactile dot or something on it.