I have Thule wingbars (not edge) and they're pretty quiet without the bike carriers or anything else on. That said, I was a bit disappointed the feet don't have anything to locate into the holes on the rails, which makes taking them off and on more of a faff as you have to visually try and make sure everything is square-on, and measure the distance between the bars.
For anyone with the Audi crossbars, presumably those feet do quickly locate into the correct places on the bars? How are they generally in terms of ease of installation/removal, and noise? I'm assuming they have a T-track that will take Thule accessories?
It's a bit of a shame they don't seem to have any literature anywhere explaining how they actually work (which is why I went for Thule initially).