A neatly-done retelling, taking out quite a lot of the original and yet leaving the core structure to support a different story.  Much more modern language throughout, straightforward to read.

I understand why this worked better as YA but would have liked a version with older characters too.  I don't think it's essential to have read the original, but I think if you haven't, you'll need to be the sort of reader that can just roll with some slightly odd plot points and behaviour, since some of the context is thin otherwise.