Before I start my review, I need to say that I received this product for free as a review copy with the express intent to review it.
The biggest thing that stands out as odd to me about this group of subraces is that it is designed as if it were for pathfinder, with abilities that can be optioned to replace existing ones, instead of adding. I'm not saying this is bad, just that it is an odd choice.
While each of the subraces are interesting and bring something to the table, from reading the abilities, besides some small details I have a hard time seeing what the real difference is between the subraces and the core, they feel like slight variations upon the theme, and not actual branches of a tree that are their own thing.
If you can get past the pathfinder styled character creation, there are a lot of options for variety within these subraces which some people may find very freeing and open a lot of possibilities that don’t keep them pigeonholed like some races can do.
There are four backgrounds within this product as well and personally, I find them much more interesting and flavorful then the subraces themselves. The cliff diver in particular has a lot of flavor opportunity for interesting characters.
I do find it to be a bit too strong for a couple of backgrounds to offer roguish expertise to animal handling. While this can be a very rare and underused skill, offering expertise for free as a background is very strong.
The features for these are all standard fare except for the Weeper, which has a feature that I personally find very interesting and great for character development and roleplay, something a lot of backgrounds don’t really offer often.
Lastly as far as the included content goes, I want to talk about the Falconer background and Falconer's kit. It is a great concept, and there was a lot of research and work done into the kit, which is fantastic. The only problem I find with this is that there are no real mechanics to support it. You don’t get or have a bird with this background meaning that most of the things included you can’t make use of, and would really require a caster with find familiar, or a ranger to use properly.
Finally, the art included is nicely done, it shows off exactly what it needs to, and even shows examples of backgrounds and subraces being mixed, such as the vulture horseman or cardinal falconer.