i have about 100 games on mine and its still rolling very strong.
i always hear about ebonite balls dying quick and was hesitate to drill the mission but am glad i did. its one of the best balls on the market.
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300-4 (the one, black widow, jigsaw, mission)
299-3 (solid uranium x2, cobalt pearl)
298-1 (jigsaw)
800-3
(299-278-267-844 solid uranium)
(279-255-290-824 solid uranium)
(290-258-300-848 mission)
290-5 ( solid uranium x3, dirty bomb, mission)  
278x1 (back 11 with venom)