I use BBF. There is a learning curve and it will take some time until one becomes completely comfortable with BBF. If you are a long time shutter release button focus person, the initial plunge into BBF is very awkward. One of those muscle-memory things. Obviously, the more you use BBF the quicker you will arrive at your comfort level.
If you are shooting stationary subjects where you have time to move your focus point around the LCD/viewfinder ... it is better to frame and move a focus point.
If you're shooting a non-stationary subject where timing is critical, BBF can be a wonderful tool. I shoot a lot of action and with BBF I can slam my focus finger and pump the BB without having to temper my slams for fear of releasing the shutter. Not having to worry about 'shutter release finger modulation', (depressing the shutter release only halfway down), is just one less thing for me to worry about and I can concentrate more brain power, (a commodity of such short supply I shouldn't dilute what little I have and spread it around), on composition and timing.
For me, BBF has been well worth the effort.
Gary