Took delivery of our qs4 this afternoon.
No apparent rattles in the premium audio subwoofer. Based on how it sounds though, I might want to check and see if they forgot to install it. This is hands down, the second worst factory system I have ever heard in a vehicle manufactured after about 1982. ( The worst is my Elise). Fortunately, car audio isn't a big deal to me.
We brought it home in the rain. I noticed one "crab walk" on a tight right hander over a hill crest. I couldn't duplicate on flat ground though.