Right after getting the carriers off jojo about 6 months ago I've finally pulled my finger out and fitted S3 discs to my A3.
Took about an hour to change the carriers and discs and its all looking good.
There's not much room behind the wheels now though... you cant see through it...its all disc :)
Test drive coming up after a brewski :)
Anyone thinking of doing it its easy.... if you can change brake pads then you can swap the whole lot over :)