Great resource if you are playing a Druid, or DMing games where there is one! Saves the headache of dealing with OP druids constantly bringing 8 pixies into the fight :)
I think it's great as it is. And it IS official: includes all the summonable beasts and fey from MM, VG, POTA, SKT as well as the author's own bestiary (which I strongly recommend for house-rule games). Simply re-roll if you hit one that's not in the WoTC books.
[5 of 5 Stars!]