It took me nearly half a decade to finish this one. Not that it's terribly difficult, I just put it down at some point and forgot to finish it. I suppose that's not really a ringing endorsement. Oh well.
This installment in the series feels much like its predecessor, The Phantom Hourglass. The hook here is that over world travel takes place on trains rather than boats. Also, this time around Zelda is with you as a spirit who can possess the bodies of various armored "phantoms". This leads to some decent puzzles in which you need to control both characters in order to achieve your goals.