Originally Posted by Bill W
I tried it, and went back. AF-ON is mapped as an AF-stop button, so I can drop into One-Shot(-like) mode whenever I need.
I've read about the AF-ON methods in several places, mostly sports and wildlife photography. I just don't find it natural - if I'm already holding the camera in my right hand, most likely needing an opposing thumb to be helping with the grab, I don't want to have to use that thumb for another heavy-duty user input function. Again, that's just me. If I wasn't shooting so many different kinds of things, I might find it useful.