Works perfectly on my Astra Coupe Bertone and my Pioneer car stereo. Mounting 30min (the position of a wiring behind my car stereo, but is easily installed with the diagram provided and anyway, it's natural, it can not be mistaken.
In short I get the steering wheel and at the same time, keeps the full display on the TID the date is displayed rather than erased by the ignition of the car radio.
Moreover, I have not felt the power supply permanent concerns - 12v cut, because anyway Opel invert the 2 12v wiring on the car radio beam to keep the memories. This interface does not modify it.
So I recommend if you are seeking, and in addition has an unbeatable price at amazon as always