eh...wow...'guidence' this word a bit too strong lah,
james...
anyway, hm, personally i think that most of us will agree that we
need balls for different lane conditions, so that we can adapt
better, and let the ball work, rather than making ourselves work.
So i do recommend that you shortlist the kind of conditions that
you will more frequently encounter, and get balls that suit that
kind of condition, (but of cos, driller makes a difference to the
reaction of the drilled ball too...) 