Have the original radio in the Mazda 5 Bj. 2008 replaced my wife this way, with a suitable adapter ([...]) also works the steering wheel remote control problems, the sound is also much better. Regarding radio reception I can not say anything. My wife it was important to be able to connect USB sticks and iPod / iPhone. When playing the i-little device, there was only the problem that although the menu was displayed and the radio has done so, as it would play what, but heard was nothing. A clear case of RTFM: funzt. Bluetooth connection of iPhone (4S / 5S) easily, good intelligibility of hands-free, the microphone cable is long enough to make it to lay hidden until the roof if you want.