Just purchased the VX MMI stereo from Triedntested.co.uk after reading positive reviews on other forums. Just wanted to give you guys a quick review on it.
Installation on it was really easy, it came with the correct wiring plug and it was really "plug & play". The interface is great, very easy to navigate around and found all the functions first time around. Graphics ain't bad either. The steering wheel controls all still function, along with the CiD which is incredible. Had a pioneer before that and couldnt get the steering wheel functions to work.
The picture quality when playing DVDs is excellent.The large, 6.5" screen is ideal for GPS navigation, you can watch a DVD while receiving route instructions from my main man TomTom.
Anybody looking to replace the factory headunit should purchase the VX MMI as this is the only headunit epecially made for the Astra unlike the pioneer which is universal.
I went to their workshop in Luton to get it installed. Nice bunch of guys.
Here is a link to their ebaystore http://shop.ebay.co.uk/merchant/ttints