Now, I've only got the PDF as of yet, but I like the book for a few key points: First, my favorite character is a Hellknight Signifer of the Pyre. Second, my current character in Jade Regent is a Witch (winter witch), and I wanted some more winteriness. Third, an upcoming player in my Rise campaign is playing an aristocrat (for which I'm going to introduce the Noble Scion prestige class)
Here's the problem: two of the three classes I've looked at in this have serious flaws. Maybe not for the more experienced, perhaps, but anyone looking to add flavor to a character without rules wading is in for a surprise.
First, the Hellknight. Okay, okay, it's well designed to be able to support oracle, cleric, inquisitor, sorcerer, wizard, even probably druid levels before the prestige taking. But... Arcane armor expertise? You get that as a bonus feat.
...Expertise? What? Does that mean mastery? Is it a feat, or a class feature stated elsewhere?
Second, the winter witch. With James specifically calling out the WW, I thought for sure it'd be incredibly worthwhile.
Turns out, not so much. Besides only being able to take levels in it if you're ALREADY a winter witch, something I didn't mind too much, it's also worded incredibly badly. The first level doesn't add a level of spells per day, but levels of the PrCl stack with witch levels to "determine spells per day, spells learned..." What? So which is it? What's my caster level?
The errors and missteps in the Winter Witch prestige class go on and on, and it'll take a few hours with my GM, a lot of scrap paper, and some red ink for me to actually take levels in it.
All told, it was worth receiving anyhow, and has a lot of flavor for any class and concept you'll ever deign to play.