I just bought Eternal Darkness at work last week and I'm in love with this game! It's the first game I've played in quite a while that makes me lose track of time.
And the music... well, the sound quality is such that it sounds great even on my cheap bedroom TV.
Only thing: I'm making sure to not play this game during weeknight cos I'm afraid I won't get enough sleep for work!
And I have yet to experience everything from the game (I have seen the sanity meter but haven't seen any insane effects yet; nor have i have found everything to make magick in the game).
If the game continues that way, it may well be the most engrossing game I've ever played.