No car I've ever own with front sensors has had them automatically enabled under a certain speed, what a PITA that would be.
Automatically enabled Front Sensors really are good - once you've had them, you really miss them.
It really is a backward step having to switch the front ones on.
As previously stated, if you don't know that there's an obstacle there, by the time you hit it / scrape it, it's too late to reach for the button then - Damage already done.
Same thing with the folding mirrors.
Last car had them so that when you were going down a narrow street (or cars parked down one side), you could flick the switch and have the mirrors instantly fold in / out.
You could even change direction mid-fold.
On this car, it thinks about it for a couple of seconds and then reacts. No chance of an instant in/out flick.
Makes all the difference when you're trying to avoid some Nutter coming the other way thinking they need the space of a bus.
Have to say that I thought Audi electronics would be more cutting edge over mainstream rivals.
I do LOVE the LED Lights though - they are absolutely fantastic.