Just finished the book. While there is a lot in Mr. Harris' very exciting book that bears re-reading, one thing I will take with me is his chapter on "Experiments in Consciousness". The most useful sentence is this one:
"In subjective terms, the search for the self seems to entail a paradox: we are, after all, looking for the very thing that is doing the looking."
While I hesitate to compare Mr. Harris' work to anyone else's, this idea seems to me to reflect some ideas of Jiddu Krishnamurti, e.g. his "thinker and the thought".