Sometimes you set out to create player options and you end up with something that is more a tool for GMs. That is what I see this product as. It provides a host of options and customizations for Aasimars, but nothing really stands out as an exciting thing that really makes me want to make my next character an Aasimar.
What I think it does very well is give DMs a tool to flesh out their Aasimar npcs very easily. Alternate racial abilities, and defining features are laid out in neat tables to allow for random generation. A very useful tool if you suddenly have need of an Aasimar npc you havent planned for. For those who have ever had a party member take the population breakdown of a town or a city as a challenge to meet every one of the races mentioned, its nice to have a table to roll on to bring up a detailed character to life quickly.
Airin the Elysian Blooded, Steadfast, healer, with Copper Hair and silver fingernails, already has a ton of character even before the first words are exchanged with the PCs. And that is before rolling on the origin chart on page 16, which provides 12 interesting starts for an Aasimars Backstory.
There are also several sample NPCs of a variety of CRs that can be used in a pinch as well. They have detailed backgrounds, and descriptions. They even come with individual hooks to work them into your campaign.
There is also the issue of some of the information in the product conflicting with the Advanced Race Guide. It isn't a major issue, but is one that you will have to be conscious of when using this product. In particular the age, height and weight charts, and the racial favored class bonuses differ from the ARG. Again I don't think it's a problem, just check with your DMs on which you
[4 of 5 Stars!]