I give Haney a bit more credibility because he worked with Tiger for a number of years. Hank's book about Tiger wasn't a hit-job... in fact - it was mostly very complementary. And there were some things he wrote, things that I have no reason to doubt, that enlightened me about how complicated it was to be Tiger's swing coach.
He caught 9 types of hell for writing the book, despite the fact that he and Woods had an open arrangement that didn't involve a contractual non-disclosure agreement. And despite the fact that 95% of his book painted Woods in a positive light.
Tiger didn't pay Haney jack-shit, despite Haney making himself available to him 24/7. Perhaps that was the reason Haney wrote the book, deep down. That he invested so much time and effort, and wasn't awarded in kind monetarily, that he took advantage of not being bound by a non-disclosure agreement to write a book about what it was like to coach the greatest player of our generation... the positives, the few negatives... but Hank never came across as bitter about the arrangement.
Hank's book wasn't a TMZ hit-piece. It was quite enlightening about just how great Tiger's talent was, yet at the same time - how difficult it was to coach him sometimes.
Haney's book was excellent. And it was so because (for the most part) he relayed the positive aspects of their relationship, yet at the same time revealed how difficult it was to maintain it on occasion. Tiger was a very complicated person, with lots of emotional baggage that didn't surface until many years later, in various ways.
But it wasn't Hank's goal to humiliate him or expose him. Anyone who has read Hank's book will likely come away with the same opinion.