I emailed Thom immediately after testing my D300 body post 1.03 release. I upgraded one and left one alone. I indicated that I found 2 major differences between the two rather quickly and asked if he had seen them. At that time, he indicated that he had not. I also posted a query on this site asking if anyone had seen changes without indicating what I seemed to be experiencing....I didn't want folks thinking I was nuts since many here think that already! Apparently Thom now has experienced them. From his site (buried in his D3 notes): "Nikon has a habit of sneaking in unknown changes at firmware updates. Indeed, if you've got a D300 you should probably already have noted that there appear to be two unannounced differences with the latest firmware for that camera. First, the 14-bit hesitation seems to have been either removed or lowered significantly. Second, there seem to be improvements to auto focus tracking of some motions; I notice this especially in 51-point.." Perhaps this is why I'm now shooting 51 point for almost all of my flight shots The acqusition speed still sucks for BIF with a TC on board IMHO and unless the birds are at distance (greater than 35 or 40 yards), I don't even attempt it any longer.