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It's not reliable, it can accurately tell inside and outside, but it can correctly call based on height, because it changes for every batter.
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False. Questec strike zone heights were set for each batter by the operator. Its being termed a failure is a subjective opinion, a lot of non-umpires and pitchers thought it was excellent. It was such a failure that MLB will keep using it though at least 2009:
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Major League Baseball and the World Umpires Association (WUA) have ratified a new collective bargaining agreement, effective January 1, 2005, and extending through December 31, 2009... The agreement included a resolution to the grievance filed by the umpires as to the use of the QuesTec umpire information system. Major League Baseball retained the right to utilize the QuesTec system along with other evaluation methods to review strike zone performance.
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