I think this is a neat addition and will probably allow my players to use it in my future games. The options for elemental breeds are very interesting. I was disappointed in the lack of fluff and the fact that the tiefling options only included the female devils and demons. I would have liked to have seen an Ice Devil or Chain Devil option. Some of the less 'sexy' devils that would give interesting options for roleplay and flavor.
Definitely worth the purchase but not all that it could have been.
Thanks for the cool new options!