By now nothing, the car is working perfectly.
The astra has an excellent built quality, with an excellent performance too. I think is a better car than the Jetta.
It cames with an excelent level of equipment with a reasonable price.
Good results in crash test according to the EURONCAP (front and offset, 4 stars)
I love it!!
The only thing I don't like are the horn buttons position.
I agree with your point: Astra is a great car, and its design provides distinction to the owner. On the other hand, the horn buttons' position should not interfere driving, or airbags operation. Initially it made be hard to get accustomed to their position, but once you get used to it everything turns better.