I just got my 2X back from Torrance today - having sent it in on 4/21 via overnight shipping. They returned the favor and shipped it overnight back! I was pleased. I sent it in primarily to have some hot pixels mapped out - just couldn't bear seeing them in ISO 200+ photos on such an expensive camera. Removing them from each photo was not a big deal of course. I also asked them to calibrate the focus, which they state they did. The few problems I saw with focus (viewfinder vs. actual image, some front and back focusing) appear to be gone. I haven't done a lot of af-c with moving subjects (well, my three year old, but they haven't developed the AF that can keep up with those) but I plan on learning how to capture the very common birds of prey I see nearly every day. I actually never spoke with anyone at Nikon. I just wrote up a letter and sent it on in.