I bought the book today and have skimmed through it reading sections here and there so I haven’t read it in detail yet but so far so good. I'm a huge fan of playing casters and manifestors so you can take my opinions with a grain of salt.

There’s a lot of Warlock love in the book, maybe a bit too much. Two of the prestige classes make me reluctant to play any arcane or cleric class without a few levels of Warlock.

The beginning of the book has some very interesting takes on different types of casters and suggested builds.

The alternate class/feats section has a new type of feat that makes the arcane caster a bit better in combat encounters. I’ve experienced this as a player and DM when the caster runs out of spells most parties decide to call it a day and rest even if they have only fought one or two battles or if only a few hours,game time, have passed. With Reserve feats you can extend in game adventuring time without giving the caster to much extra power.

A quick read through on the prestige classes makes me want to build an arcane caster for my next character, I’n not a fan of arcane prestige classes before now. Eldritch disciple,Eldritch theurge and Ultimate Magus look good for pure casters while the rest have benefits for muilticlassed characters or specialists.

As always new spells and for a change more Warlock love with new invocations. New magic items are always fun as well some I like some I don’t, I’m not sure about heward’s fortifying bedroll I still have to work my way around the wording of the items powers.

Just my 2 cents worth