None.
I had 5 V8's before I bought this car and I love it. It pulls extremely well off the mark and cruises effortlessly at 100 clicks. I would not consider it for towing anything, but as a highway car, which is what I use it for, it is excellent. For overtaking, economy, and reliability its fantastic. You won't fit more than two adults comfortably in the back, but it is a small car not a big six. I had a VR Commodore V8 before I bought this and far prefer my little Vectra for performance and handling, especially cornering and cruising. It will find an extra 30 to 40 ks over the speed limit for overtaking in a flash and has really surprised some of my V8 driving mates at its pulling power off the the mark. It's a little rocket!!!
Great review. I just bought the same car and I find your review to be very accurate all round. It is a very smooth and fast car to drive.
Very accurate review. I recently picked up the same car (2.2 litre automatic GL, 99 model) second hand and have only had one problem - one with the alternator. But what can you expect with second-hand vehicles?
The Vectra is a powerful little car with features to spare. Glad to know the reviewer had such good success with his too!