Quintessential Series and Eberron

[LoneWolf23]

I'm running an Eberron campaign, and I have a substantial collection of books from the Quintessential series, from Fighters to Druids II, and I've been wondering about using stuff from these books in Eberron.. I know that Wizards' official stance is "Anything that's made for d20 has a place in Eberron", but I am curious about whether or not folks here have tried adding Quintessential book material to Eberron. Including material from the Quintessential race books.

 

[Stone Dog]

They mean core D&D, not D20 in general. Heck, even Keith Baker has said something like "the Libris Mortis isn't a core D&D product so don't expect Eberron vampires to work like the ones in the LM" on the WotC boards.

That being said, I've never even picked up a Quintessential book so I have NO idea how any of those things would work in any game at all.