I've heard this product is amazing and am also considering having this done by a detailer soon after taking delivery. I was hated $250 + correction time, so am assuming this will be in the ballpark of your quote (hoping that it will be a bit less, as my paint should be pristine).
My understanding is that this is a very long-lasting coat, but that care must be taken to ensure the car is in great shape before application. The detailer I contacted advised not letting the dealer touch the paint, including their standard wash and prep.
Current: 2013 535i M Sport, Imperial Blue, Black Nappa, Premium/Technology/Cold Weather/DA/DA+/Ceramic Controls/Premium Sound
Retired: 2001 E39 530i Sport, 1976 2002