This is a fun, and quite original race. There is good flavor & background provided; the reproductive cycle is unique. Tantric pool is unlike anything I've seen on another Pathfinder race. Makes them a little hard to rank, but mechanically they're probably in the lower half of the Advanced race bracket.
There's a large assortment of traits provided for Noble Succubae, and they seem pretty fun also. Also provided are guidelines for using the race in Skortched Urf's Otherverse settings. They seem like they'd be an entertaining option there.
Unfortunately, the space dedicated to Otherverse probably caused the most aggravating thing about the product. There aren't any Favored Class options, Archetypes or Racial Feats. They probably need a Sorcerer bloodline also, since they're neither Abyssal nor in any way connected to Celestials.
The other Native Outsiders are almost worth playing just for their Racial Feats. Instead of a chance to further develop supernatural otherness, the Noble Succubus get one general feat as a virtual. There aren't any Alternate Racial Traits or Subtypes either, but I'm not convinced they're necessary for this particular race. Not sure if the intention was to put out another book later with all the options, but they are sorely missed in the product.
There are also some parts that are vague or confusingly worded. None worse than their language description.
"Noble Succubi speak a strange dialect of
Infernal and Common. Their dialect is almost
incomprehensible to other Infernal speakers; true
Succubi especially have been known to disembowel
anyone speaking this ‘vile and offensive tongue’."
So what does this actually mean: they speak neither Common nor Infernal--and can't learn them as bonus languages-- instead only speaking their unnamed creole/pidgin (which is what it says); they speak both Common and Infernal, but have an excruciating accent and code switch more than anyone else can follow; they speak Common, Infernal, and their own (possibly secret) Common influenced Creole Infernalis? For that matter, why Infernal and not Abyssal? We are talking about Succubae here. How well do Common speakers understand them?
Overall, I love the race and think they'd be a good addition to a campaign. A Noble Succubus as a Summoner would be a strong power-build (they can refill their Tantric pool by making their Eidolon's night), and they'd also make great Oracles and Magisters.
However, there may be more work required to initially integrate them as a PC race than some DMs would like. Still at $1.99, it's a good buy despite the issues I've mentioned, and homebrew friendly groups should find a nice opportunity for further development.