One of the folks in the office was playing this a while back, and we eventually had a competition to see who finished it fastest their first time playing.
I found the actual puzzles to be embarrassingly easy, though I took an embarrassing amount of time to get used to the first-person perspective.
Recently this came out:
It's an unofficial expansion or somesuch. About as long or longer, professional quality, and substantially more engaging(actually difficult sometimes).
Knowledge and the Leader are the means.
Life is the end.
These are my words, this is my belief.