Nothing.
This is a fantastic sports sedan. The suspension is definitely on the firm side (which I like) and allows you to really throw the car around, however there is a bit of bouncing on Australia's poor roads at times.
The engine is a real goer, but prefers to have a few revs on the board to give its best. I bought the auto, however I'm wishing I had the manual to go with the revvy engine. The interior is very classy and has a really cool dashboard and functional layout. I drive 90% in traffic, and have got about 10-14 litres/100km which is slightly above what I expected. Then again, on the highway it will drop below 10L/100kms. Overall I love this car and my only gripe is that the Australian version gets 16 inch wheels and not the 17's. Otherwise just go and sing a cheque, you won't be disapointed!
Well, you're lucky! My 2004 Accord Euro is full of rattles. The first one started a few hundred meters from the dealership! The windscreen/dash creaks and cracks despite the windshield having been replaced. The doors rattle. The dash rattles. The overhead light/sunglass holder rattles. Despite 10 days in the shop and a year down the track I'm no closer to a solution. I'm extremely disappointed, especially since I paid a premium for "quality". So much for their ad campaign that says "isn't it nice when some things just work".