Briefly:

You may recall that I read and adored the book this movie is based on not long ago.  (Read it!  Readitreaditreadit!)  The movie changes some things up, but leaves the base intact.  Unfortunately, a large part of the book's appeal is how incredibly strong and engaging Momoko's voice is, and that doesn't carry over as well to a visual medium, though the strange outlook on life and jaded Lolita-ness are still there.

( brief comments on the changes )