I'm not sure what you mean by authorized and unauthorized, but I guess I should feel lucky that they replaced the drive unit at no charge, as expected (covered under the 8 year warranty, using a remanufactured part), but also didn't charge me to replace the 12V battery (I believe this is the 5th one the car has had in 43K miles).
They did charge me $160 for the rear toe links, and $87.50 for "general diagnosis," which is apparently 50% of their usual $175 diagnostic fee. I'm not sure how to feel about that--did they give me half off, or did they charge me for finding a problem I didn't ask about?
At any rate, the car is running OK, at least for now.