I have The Judge urethane ball.
It needs a dry lane with little oil.
On any modern house shot with oil the ball can become little more than a spare ball.
But when the lane has little to no oil, this ball is a beast!
I have never had a ball hit harder for me when the conditions are right.
But if the ball gets any oil on it, the oil saturates the ball and makes it a deep shiny black and then the ball will no longer grab.
Wiping the ball will not help, as the oil gets trapped in the deep grooves of the ball. Remember this ball is 320 wet sand!
This ball depends entirely on "mechanical friction", the grooves being able to "dig in". But if oil gets in those grooves then it is done.
I love the ball when it is dry, but when there is some oil, then it will work for three throws and then it is done.
And I roll the ball very slow, and I am a Full Roller with a low rev rate and 90 degree axis rotation.
Usually I can get almost any ball to grab, even plastic.
What I have found that is weird is, I have a 1970's rubber ball, polished. When there is oil on the lane and the Judge starts to lose its reaction, the rubber ball will not lose its reaction.
The Judge gets saturated with oil in the grooves, but the oil on the rubber ball stays on the surface and can just be wiped off and the ball is dry again.
The rubber ball can hit hard and carry on oily conditions the Judge cannot grab on.
I assume this is because the Judge depends on the pure "mechanical friction" of the grooves while the rubber ball is pure "chemical friction" of the smooth polished rubber.
I am wondering if I took the grit of the Judge up to 1000 grit or higher if it would actually do better on modern conditions? Perhaps the oil would not get trapped in the ball.
I have an original 1980's AMF Angle Plus urethane ball and this ball does better on modern conditions than the Judge does. The AMF is more resistant to oil saturation, though even it can get wet and lose its reaction too, but it takes much longer and much more oil.
In case you want a comparison look, here are some videos. One of me using the Judge on very light oil on a very abrasive lane surface, then the AMF on the same surface and finally one of me using my rubber ball on medium oil on a much faster Anvilane surface.
Look at the difference in how the balls react to the lanes:
The Judge
https://www.youtube.com/watch?v=WCn0z6SAQGEThe AMF Angle Plus
https://www.youtube.com/watch?v=nSfKv_-od7sThe Rubber Ball
https://www.youtube.com/watch?v=iYdfF4m_KxsFollow up: I recently took the Judge down to 180 grit and this made a huge difference on modern house shots for me. Now the ball doesn't seem to lose all its energy once it gets wet. As it gets wet it still does weaken until it reaches a state of equilibrium, but that state is still such that the ball grips and carries like a truck! But what's great is the ball is still smooth, straight and controllable, it does not jump or over hook. Control and power are now in perfect combination.