As near as I can tell, this is just the OGC sanity rules from Unearthed Arcana (and hence, from Call of Cthulhu d20) packaged by itself.
And you know what? I'm totally okay with that. Since, I don't own UA myself (although I do own CoC d20 and BRP), I find this product convenient and useful and helpful in the extreme.
(One wonders, though-- and this has nothing with the nice folks at APG, who made this product-- how do the folks at Chaosium feel about their one-time, license WotC of the cost product becoming the vehicle for their proprietary sanity system magically turning into Open Game Content for anybody to use?)
<br><br><b>LIKED</b>: The Cthulhu sanity system is excellent, and I like it applied to any d20 game. It ought to be in a lot of games.<br><br><b>DISLIKED</b>: More new game material would've been nice, but the added historical stuff is certainly interesting and a nice touch. I paid for the CoC Sanity System adapted to d20 in a modular way, and I got what I paid for, and I'm still a very happy customer.<br><br><b>QUALITY</b>: Excellent<br><br><b>VALUE</b>: Very Satisfied<br><BR>[THIS REVIEW WAS EDITED]<BR>