One thing to keep in mind that I failed to do. If you have a case, the lightning adapter might not fit. I may cut down my case to make it fit since it is rubberized if I cannot find one that will work online. Otherwise it works fine.
As for the people with the Error 03, this happens to me at random. I have had it happen to my 3G, 4, and iPad 2. The way I have gotten around it is to disconnect the device, remove the face, restart the vehicle, add the face, then plug in the device. Seems to always work for me. If I reset, that works too but you have to reset the clock and a ton of other stuff. For whatever reason it will not keep all of my user settings and I have to redo the bass and treble settings but is will keep loudness and some others. It's weird.