Easy job to connect up electrically. It took me an hour to put the stereo back in (CD70) without trapping wires etc.
Once in it's an awesome system, I've got the MKi9100 as I didn't want the amazing screen of the 9200. I only needed a small amount of information.
Thanks to everyone who has posted guides etc. I've ripped apart the dash in my previous Vectra so that was easy, the information about the mute wire was key. I was using a SOT-122 fully wired. It had a pinkish wire with a spade connector coming out, connected this to the yellow wire and hey presto it all mutes/pauses cd etc.
Sound quality is fabulous. Now I have a CD70 and Bluetooth/iPhone Control via the Parrot.