One potential problem with the World Class is that it not only REQUIRES a good deal of oil, but also it requires some ball speed. It is one of the earliest rolling/lane grabbing balls.
If your "ex" does not have at least average ballspeed and if there is not a good deal of oil on your lanes, then I'd consider another ball OR be prepared to add some polish to it.
FYI Its "sister" ball, the Big Bang, is also on closeout and it, while also being an oiler, was designed to get slightly more length and thus slightly more backend than the World Class. However, being strong oilers, it too may also need some polish.
CheapBowlingBAlls has the World Class for $96 -
http://www.cheapbowlingballs.com/bowling_balls/lane_masters/world_class.phpI no longer see the BB on their website; they have sold it out already.
They also have the New Standard for $95. WHile as much of an oiler as the BB and trhe WC, it is still a VERY arc-y ball, still a particle ball and still my favorite Legends ball and one of my favorite balls of all time. There's a chance it may not need polish for your "ex" to use it well.
http://www.cheapbowlingballs.com/bowling_balls/lane_masters/the_new_standard.phpIt is also a beautiful looking ball, to my eyes, especially with a touch of polish.
Good luck.
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"None are so blind as those who will not see."
