The most important high value information obtained by the waterboarding of Abu Zubaydah - the identify of Khalid Sheikh Mohammed - was obtained without the use of such methods, but rather through traditional interrogation. So was the identity of Jose Padilla, himself later subjected to such abusive methods that his mind was effectively destroyed - and we should remember, that Padilla was never charged with the high value crimes for which government officials justified his mistreatment.
The author is blunt:
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There was no actionable intelligence gained from using enhanced interrogation techniques on Abu Zubaydah that wasn’t, or couldn’t have been, gained from regular tactics. In addition, I saw that using these alternative methods on other terrorists backfired on more than a few occasions — all of which are still classified. The short sightedness behind the use of these techniques ignored the unreliability of the methods, the nature of the threat, the mentality and modus operandi of the terrorists, and due process.