Off the top of my head, without putting much thought into this, I have to say that James Joyce and William Faulkner have to be at the top of my love/hate relationship for difficult well-known authors. Give me a few minutes and I'll come up with a few second string players.
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--Some of us look for The Way in opium and some in God, some of us in whiskey and some in love. It is all the same Way and it leads nowhither.