well as the DM I am the mostly only one who has used it yet.
I offered retraining as a story award, and only half the players used it (for 17th lvl charaters played from up from 4th or 11th) I allowed another to rebuild as part of a celestial quest. 3 paladin levels solved a lot of problems he was having with his straight fighter, but he skipped on the Ftr feats, (he thought they were overpowered, I guess)
The mage was granted the imbue familiar feat temporarly, but decided he didn't want to loose an existing feat for it.
I have a dragon shaman coming up in the game shortly, and he might get taken as a cohort - but he will have to change totem. So more likely he will hang around for 2 games then be ejected.
I really do like the equip, spells and feat lists - they make NPCs much easier.
Its a good book, but in my established game, with conservative players, its not getting much use.