I had this ball and I loved it.  I had to moved up in weight and decided to go with the Thunderstruck Solid instead since my pro shop could actually order that one.  I would have had to order the Dark Thunder online again and that makes me nervous for some reason.

I totally miss that ball...  Very smooth and nice arc.  We are getting it re-drilled for someone else on my team now and it is going to make me sad to see someone else using it.  Well, I guess at least it is doing something other than sitting in my closet.
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Special...  Agent-man!

I LOVE my Dark Thunder!!!  So much that I am buying another one and I bought the Pearl.  Really smooth and packs a real punch at the pin deck.  Best ball I have ever owned.  Easy to control and really consistent for me, even with carrydown.
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I'm a wabbit swayer!!  ...a guitar pwayer!!  Wit a nasty habit...   Kill Da' Wabbit!!
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I agree that the Dark Thunder is a good ball, but be careful that you are buying it for the right use.  As Mr. Bunnie has mentioned this is a great SMOOTH ball - but it is absolutely not an Ultimate Inferno replacement.  Dark Thunder is a medium oil ball - not a heavy oil ball by any stretch.  I'd look at the Special Agent as an Ultimate replacement...  It will be stronger and more continuous. Dark Thunder would be a replacment for a midrange ball like a Vapor Zone (not exact, similar condition).