Hi There
As I understand it (I don't have the lens this time around); it's wonderful for portrait / wedding work, but not that great for landscapes and product where edge definition actually matters.
I'm looking forward to the replacement, but in the meantime, I've been finding that the newer 70-300 AFS / VR, which is about 1/4 the price, works really well on the D3 - sharp, and although it's no low light demon, the ludicrous D3 low light performance and auto ISO feature makes it very useable, and it's a great deal sharper than any lens of that calibre deserves to be!