The new story is entirely independent of the first one and all of the characters have evolved while acknowledging the passage of time since we last saw them.
The movie gets a bit rushed at the end, presumably to keep it at a young children friendly run-time. Also, there's a bit too much Olaf for my tastes.
The new outfits are cool and the new music has some oomph, even if none of the songs quite have the catchiness of Let It Go.
The sisters are really great protagonists. You have to love them both and want them to succeed independently.
I'm already looking forward to seeing this movie again.