For those that enjoy Anime, I just watched this over the weekend on Netflix...
I flew through the entire season in 2 days and am really looking forward to the second season starting on 12/27. I knew nothing of the Manga it is based on and only heard of the series from a friend who recommended it.
If you are into Anime the simplistic and overly expository dialogue won't be too jarring to you though it is a little more than usual with this series. I haven't watched much Anime in recent years with the only other series I watched being Death Note (which is also awesome and on Netflix). It was a nice change of pace from all the other stuff I've been watching.