This series is wonderful. Though I cannot explain the storyline, for it is very intricate and I do not completely understand it myself, I can recommend it. If my word is not enough, consider that it is done by the same team which did "Cowboy Bebop", "Wolf's Rain", and "Samurai Champloo" - all wonderful shows. The characters are quite developed and it contains a rich plot. I do warn that if you are not a fan of having to think about something you watch, this is not the show for you; it can be very confusing at times and requires a deal of brain power to understand. If you do not take the time to attempt to understand it, by the first few episodes you will be lost, just a few more before you'll want to give up on the series. But, if you are one who enjoys thought-provoking works, I'm sure you would enjoy this.
Review of Ergo Proxy
