Just thought I'd put this in if anyone's interested. My Vectra was recently in a rear shunt. The courtesy car given to me was an Insignia SRI estate. A week later they swapped it for a VW Passat. In my opinion the Insignia was a much better car all round, actually, in every way. Both cars were new. My only gripe was that stupid handbrake!
And a PS
The Insignia was better on fuel.