Some good. Some bad. One thing I've noticed about a lot of the source books is that if they do enclude new powers/exploits/spells/whatever for an existing class, it is almost always exclusively oriented around the new "build" that is promoted in the book. Divine Powers, for example, has a Guiding Priest or Guardian Cleric or some such. There were no new feats that benefitted the existing Devoted Cleric or front line cleric. The only thing I saw that was remotely helpful for my Devoted Cleric was a new at-will power (Astral Seal if you're interested). The only feat I looked at was a new channel divinity, which was essentially useless, because the only benefits it would give were to prayers exclusive to the new classes introduced by the Divine Powers book. We have one guy in our group--the only one currently with a stable income (he's a HS teacher)--who buys all of the books as soon as they come out. So far, now one has built a character from outside the core PH classes. Sure, we've got some gear from Adventurer's Vault and the theives and fighters have grabbed some feats from Martial Powers, but that's about it. Oh, one player made a Shadderkai (or however you spell it) brutal rogue, but no classes have been used, and I'm not sure what the racial bonuses are, if any--might as well just play a human.