Just recently bought a set of genuine audi roof bars for my avant which are top quality and very easy to fit, and tomorrow I am picking up a couple of Mont Blanc Barracuda cycle carriers for use with the roof bars. I had a look at the genuine audi cycle carriers and suspect that they are identical to the Barracuda apart from badging. I can let you know their quality after tomorrow if you want........or maybe someone else on here already has this type of carrier??
I got myself a detachable tow bar and then a tow bar mounted rack. Its perfect as it drops down so you can still get into the boot, and girlfriend can load them on without having to lift them onto the top of the car.