Thanks for all the helpful info. Yes, I use AF-C and spot focus. So I pick a point to focus on (using the back button), focus lock and then let go. Then when I go to shoot, it's out of focus again...so I start all over and the continuous focus is going crazy trying to focus.
Everyone keeps saying how great BBF is, but so far, it's just as difficult as using shutter release focus. I will keep practicing.
Thanks to all for taking to the time to answer.
Don't let go! The 'C' will only follow while the focus is activated. It's not an on/off switch. If using AF-S, holding the BBF lever will lock the focus, and then you will have to rock to maintain focus on the focal point.