Haha the big ball. About as much fun as the heavy ball.
In college they were turning me into a PG (SG in high school) and made me dribble the big ball (well two of them at once) during ballhandling drills and other drills involving handling and passing. Never thought it helped much, other than get me yelled at when the ball would get stolen. (****, it's a big ball, my grandmother could steal it!)
And then comes the heavy ball. I remember doing the Mikan drills with a heavy ball then almost breaking the backboard with my first lay up with a real ball in practice. Silly stuff.
The big ball's only use to me would be in rebounding drills to make sure there were more misses. But then why not just put the bubble on?