I had first heard of 'Silverwing' when it first started airing on Teletoon, however never did watch it. Recently I found the books for cheap at the thrift store and, after reading them, knew I had to see the series. I purchased a videotape containing every episode off of someone. I was expecting the storyline to be watered down, full of fillers, and to deviate far from the book.
What I saw was the exact opposite.
'Silverwing' is pure, epic action, straight from the beginning. The show, though changing small aspects of the book, remains very faithful to the overall flow of the original novels. The key points are all still there, and in some places, better explained. The animation is rather good for a TV series, and the voice-acting is bang-on.
'Silverwing' also has a very strong movie-feel to it. The tape I bought had all the episodes edited together with the beginning and end credits absent (except for the beginning and end of the entire tape), as well as all commercials cut. Each new episode began immediately where the last one left off. No jumping around (something Watership Down had a tendency of doing throughout the first two seasons).
Though this is a cartoon, it is not exactly for children. Younger kids might be frightened at times. As for adults, well, I'm 21 and hold Silverwing amongst my favourite TV shows of all time.
My fingers are crossed that they make new episodes of Silverwing.