Initially it was too soft under the rules that were in place at the time. I have one now and I have fun when I can throw it,so I can imagine what Tour Pros were able to do with it.
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Chris
 Lane#1--nothing else hits like 'em.

If it didn't flare out on its way down there.  I remember throwing one that was a "houseball" in our school practice center.  We had a vintage oiling machine that was only capable of laying oil down to 30 feet and buffing to 42 as a maximum distance.  None of my teammates could keep this ball on the lanes.  One day just for fun we put the machine out to 15 feet, then started it, going gutter to gutter flat 60 units, then pulled it back to the foul line and oiled gutter to gutter 25 feet.  Played like the hardest shot I've ever seen in my life, but the SD-73 was the only thing we could get to move for the first 2 hours of bowling on it.

PS, it flared rings around the entire ball.
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-DP3
Respect the Game

We had one come into the shop a few weeks ago for a plug and redrill. the ball had no logos left but it was without a doubt an SD.

I noticed that some of the plugging leaked down the side of the ball so i took a bevel knife to peel it off and it wouldn't come off, and when it did it nearly chipped the surface of the ball. it seemed incredibley soft.
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Timothy @Juniors Pro-Shop
Staff Writer 7-10 Split Magazine,EGO Communications
Montreal, Quebec.