I have the Exile BT Media Center in my boat. allows for track forward and back and also has an Aux input. I use the one you got in my Audi...
Obviously the form factor of a 2" gauge is pretty legit. I like the media center over the other BT because I can be surfing and give my wife the signal to track forward if I'm not feelin' the song that comes on. But in the car, the one where I control it exclusively with the phone is best.
That said, the new WS BT that's the form factor of a carslile switch is pretty damn legit.