Pretty much everything that Frecklychimp has said on the subject I would agree with.
Most of the Horizon UK / TLR drivers continue to use the ball diff but those that have tried the gear have all reported back the same findings as the Chimp - in that it feels slightly different to drive, gives more drive (they had to back off their slipper settings) and in dry conditions they felt it was no handicap once an oil range was found that suited them.
The reason we continue to use the ball diff is that in variable weather / grip conditions, the consensus of opinion is that the ball diff is more consistent across a wider range of conditions whereas the gear diff could excel in dry and high bite conditions but that the characteristics didn't suit the wet conditions if the diff had been set up for the dry.
With the vagaries of the UK weather being anything but predictably hot, dry and sunny, we've all largely chosen to continue with the ball diff for now.
HTH
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