I have found it a very good car which I would recommend to anyone. I have an auto and the economy is a bit more than my old 230k VS auto 6, remembering that this is a heavier car, has the new motor and is a higher power output engine. With a weight in it or towing it does seem to change down sooner than the VS in the same configuration. In the 22k it has done, I have not had any problems at all. If you read some of the other threads you will find the following issues:
some like me, have the incorrect dash programming from the V8s which can cause wrong info such as fuel guage (not me) or servicing advice (me)
some people are finding that the front spoiler is very low and will hit curbs however this is the same with the SS and if you are aware of it then should not be too much of an issue
the noise level seems to be higher which some think is the auto, I believe maybe a related to a different type of engine noise compared to the old ecotec or the tyres and will need to wait til I wear these ones out and change them to work out which.
some are complaining of excessive tyre wear although this maybe a product of driving style as mine only need to be rotated
I am sure there were others which I can't remember. Just search the forum.
The paddles on the steering wheel I find are in the wrong spot. Would rather a sequential style shift on the transmission tunnel. In fact I still use the auto shift lever to change gear when needed.
Paint on mine tends to mark easily which maybe because it is black and any mark seems to be white(undercoat?) and therefore shows.
Vision to the rear could be better with the rear spoilere not helping. Would actually prefer the SS spoiler.
Headlights are very good at night and you can not compare to the VS. On my VS I had good Cibie driving lights yet virtually no difference with or without them on the VZ.
I let a friend (Au driver ) have a go and he fell in love with it although in giving the keys back he stated that he could not buy it as he would fall foul of the law very quickly.
Overall I will probably keep the car til at least 200k is on it.
Mal