So I've had the Insignia a week, let's begin.
Mirrors are Shite, It's comfortable, climate system isn't as efficient as the Omega or the Saab,, and the Infotainment system is frigging not simples, the stupid rain sensing wipers I don't like,, The auto opening boot is nice,,, and I think new tyres will be required as it's got a right old mix on, being on 245/45/18 XL it might not be happening yet.
Changing the oil+filter is interesting, if car isn't high enough you can't drop undertray flap down enough, and it's easier to remove front wheel to remove oil filter.
Despite having an arse like a big black mama the Insignia is not a bad looking car.
You seem pleased with it overall.