I've read a portion of Gurdjieff's "Beelzebub's Tales to His Grandson" and found it boring. Perhaps it would get interesting if I read more.
But now I'm reading "the fourth way" by Peter Ouspensky, the most famous (if we don't count Joseph Stalin) of his students and find it awesome. Very rational, explaining everything in an exciting, easy to grok way. It feels like a book I would recommend to everyone.