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Did you see Ep 00 - Inga-ron ..? Prequel that did pretty good justice to the series. Was very nice to get a lot of background info filled in after watching the original series and spending some enjoyable time speculating about what had come before.
I could go for a movie or two and another season of this. Really pretty animation, liked the soundtrack (available in FLAC @Nyaa right now). There was some pretty interesting political commentary about mind and information control that I really liked, and would like to see more of. I thought it was cool to scratch into the surface of AI existence and rights. Since Time of Eve, I've been wanting to see more of that and UN-GO gave a nice mini-fix of that plotline.
Overall, I thought this was one of the best recent anime I've seen. Rate it an 8 or 9 at least overall out of ten.
Haven't looked into it yet (will do that now), but was wondering about novels &/or manga for this. Any available? Any opinions about how good or bad in comparison to the anime?