I am still forming an opinion on this anime. It really hasn't caught on with me, but at the same time it isn't horrible. Perhaps the 12 episode time limit is hindering story development. A lot of things are assumed, which does happen with a lot of series like this. Is it fun to watch? you bet. But it isn't anything ground breaking. I will probably continue to watch the remainder of the series, probably because of some of the characters. Will definitely put up a short review on RGN about it.
I prefer dubs, but I won't discount a good sub. This anime has not been dubbed in English as of January 2015.