Radio reception is good for me when I plugged into the existing antenna cable, I just need to extend this cable all the way forward.
Blue antenna cable is to tell the bmw amplifier to switch into the proper mode if you have the system where the amp and radio are in the back....if you have the system in the front maybe you don't need the blue wire if your amp and so on is in the front
Souns is loud, yes...you need to install a volume switch on the line between the enco and the amplifier
Wheel buttons are ok for me, I get about a 95% working response, make sure the red box is connected properly and that vibrations cannot move it too much
Phonebook, I'm not there yet....