Well, @bchernicoff, I can't thank you enough!
That actually looked like it was rather difficult to record a video of the viewfinder while activating AF, so the effort is much appreciated. I'm pretty surprised by the speed, looks like it locked on pretty quick onto pretty much everything...so I have to agree...seems to focus "like a champ" (at least in that light!)
Any chance you could try some lower-light tracking at f/8? Just to see how it might perform in a more real-world setting.
Anyway, thanks again! Looks pretty awesome, and certainly good enough for birds in daylight.