I have to admit, I was disappointed that these were only the advanced versions of the tradeskill books. I was rather hoping for adornment recipes instead. I'm rather let down by the researchers.
I feel your pain. Doing the researchers again only to find out the reward is "adept" versions of spells 9 months into the xpac is disappointing when experts have been out there for quite some time. Granted, a few of the expert spell books are still rare, but the spells are available. I too, was hoping for some solid adornment recipes or some decent barding patterns/books. My incentive for future participation took a solid hit with this rather unimpressive reward this late into the xpac.