It's really excellent. In fact, unless you absolutely cannot stand techno under any circumstances, just about anyone should give it a rental (or buy it if you really enjoy it). The plot is really silly, but that's not the point. It's a glorified, professional AMV and a very fun way to spend an hour. There's also a few small noRAB to Leiji Matsumoto fans, like the Harlock costume in that one scene.
It's well done and literally in a class of its own, really. It's not to be missed.
My favorite track is One More Time. I went and bought it on iTunes because of Interstella 5555.