His main interest to me is the fact of having a smartphone that has the magnetic charge; if you do not have a Sony Xperia (Z2 or 3) equipped with one, and at this price, go your way!
The use of this unit is quite improved with the 4.4.4 version of Android as well as up-to-date related applications. Especially for the Bluetooth connection speed.
Short.
You can (de) manually pair the smartphone with NFC, no complaints, it works without a hitch when we spotted well as seek contact. Bluetooth will also suffering from any problem, it (re) connects as a great, as we have the Bluetooth activated if one does not use the NFC.
The application that interfaces unfortunately is not very "user friendly" at first, nor effective in its navigation and ease of use (it is worse when driving). But it does its job. Forget the talk function provided, that Google works so much better ...
The fastening system is in my opinion his greatest failure: It takes the hand to hold the smartphone correctly the first time. However, the magnetic filler catches the smartphone easily, again when the place was well located, it's instant.
The charge is as effective as a power outlet: It often happens that I do not have to charge the phone for days (though moderate use), rolling 1h or 2 here and there. That is the foot.
Unfortunately I can not give a concrete opinion on the sound, it's not my field ... In any case I have nothing to complain about. But we all imaginable panel settings (the "positioning" is stunning though).
If like me you are an advanced user of your smartphone and you drive, you have a Z2 / 3, sub and place to put it ... Go ahead. Netflix in traffic, it's worth all the gold in the world.
Photos on this subject (forum): [.....]