Watching the Unedited cut for the first time was a real eye-opener. Surely the darkest and most violent thing the DCAU ever produced. The animation is amazingly fluid - the scene of Terry falling asleep on his feet while dancing is a master class in facial expressions. I was a little miffed by how badly the producers threw Tim Drake under the bus, but this is a fantastic realization of the "Batman Beyond" world.
Interesting twist and the end of the original joker flashback is pretty cool. However, if you were not a big fan of the whole bat family idea like me, a pale after taste remains. Also: the music of Batman Beyond is horrible!