I had a 1.9 CDTI Vectra, and only kept it for 15 months. You either get one that had no problems, or one that is riddled with them.
I was never 100% confident in mine not breaking down, I had it go into safe mode for no apparent reason, had the EGR valve replaced after only owning the car 24 hours! There was a vibration coming through the clutch pedal.....DMF which is over £1k to have replaced, and the swirl flaps were starting to fail, as there was excessive movement of the connection bar, again, over £800 to have that replaced.
I traded mine in for the VXR, and have never looked back.