When I'm using AF-C I typically leave it at 51. Truth be told, I'm not really sure what the difference between the settings really means. It's not like the grid changes in the viewfinder when you choose less AF-points. For this shot above, I felt like a skeet shooter. I was looking elsewhere when out of the corner of my eye I see the gull coming my way so I quickly pulled the camera up and shot. And the fact that the AF caught it right off the bat and locked on was what amazed me. This camera is hands down the best camera I've ever used.
Believe it or not but I had on my 70-300mm f/4.5-5.6 VRII lens. In my opinion this lens at ~$500 is a bargain and is the only thing keeping me from buying a 70-200 f/2.8 and a TC.
I will be testing its auto focus out on a few things this week off, mates water skiing (well attempting) and to try and catch a Rainbow Bee Eater in flight.