Haven't used either, but have a question. If you wanted to polish up a urethane ball (black hammer), would control it be the one to use? Doesn't make much sense to use a 'reactive' polish on a urethane ball. Or I guess there's always the Lustre King!

Actually I don't believe that Control-It puts silicone into the pores of the ball.    Rather, it has an agent that creates a molecular bond with the coverstock of the ball that promotes skid.  The Control-It has to be sanded or scuffed to be removed.  And, if you bowl on a very aggressive lane surface, the Control-It in the track area can be eroded away in several games.  I think that Neo Tac recommends a recoating every 9 games or so, or more often if the effects seem to wear off quicker.