It's an ok little show, not really for me though.
I thought it was mostly dull. If you are a Christian it does have some sayings that we can apply to our life.
Not sure as to why this is rated TV-14. It has a few non-violent blood scenes (such as haibane wings sprouting and one other instance) and only says the word "damn" throughout the show, otherwise there is nothing bad as for parents to be concerned about.
Though you may want to take a look at the blood yourself as for little kids; episode 1 will give you a taste of what the blood is like. if you are looking for action anime this is definitely not the place. Reki and Rakka are the main characters but there are around 6 more people that are throughout the show. Music was wonderful and fit perfectly as well.