G6ET, you won't regret it.
My G6ET is stock, currently in Melbourne on holiday and have Hold@n Calais as hire car (6L V8)
Got the V8 cos want power + luxury.
seat of the pants, Calais is slower off the start, slower in all areas actually.
Cruise control is not as good as mine, it won't change down to slow you to the set speed on a decline.
Let it have control down one hill to see how far over it went and I gave up after it had reached 12klm over.
Mine reaches about 5 over then drops to lower gear to slow to set speed.
Mine is an 08, the only thing I like more on the Calais is the electronic goodies, the navigation system is very good, HUD is great which also includes navigation, better Bluetooth for phone etc.
Although the overall menu for the system can get a little bit clunky
still think the actual sound from the stereo is better on mine.
bottom line, Ford Turbo 6 eats Hold@n V8 for breakfast (not that I'm biased in any way whatsoever)