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There has only been one instance to my knowledge when a retab was successful. I believe it was the December 03 or 04 exam and there ended up being a computer error that incorrectly scored some tests. It might have been a few thousand tests but I can't remember now. Someone did a retab and the error was found so CFAI went back and reran all the tests to find all the ones that were scored incorrectly.

I did a retab a few years back strictly for peace of mind knowing full well that there was probably less than 1 in 1,000,000 chance it would be overturned. It wasn't but I still felt the $100 was worth it. Pretty irrational reason but humans aren't rational. It really is a waste of money but if it makes you feel better, go for it.