I just got around to reading Sheck Exley's classic "Caverns Measureless To Man".
I'm sure it was interesting in the doing for him but I didn't find it particularly interesting to read about.
The only thing I took away from it was that he was lucky to have survived long enough to become accomplished given his early dives.
I'm still waiting to get my hands on a 'reasonably' priced copy,but:
I had a similar issue with Mark Ellyat's; Ocean Gladiator. The writing style was interminable and I struggled with the prose for the first few chapters. Eventually I began to disregard this and read the book for what it was; a diving book by divers for divers. So even though I baulked at Ellyat's cavalier attitude in his early years as a diver (100m on a single tank!!!!!) and his ability to get 'bent' on nearly every dive; I ended up liking the book. It boiled down to the fact that although he his a shamless self-promoter, his skill is undeniable and his feats unquestionable (first man to dive to 300m/1000ft).