I received my 'Fell Beasts and Wondrous Magic' yesterday. Its a little of the 'light' side considering how many 'Fell Beasts' also appear in the Core Book.
And perhaps it should be called 'Fell Beasts and Wondrous ITEMS' - 'Magic' suggesting spells etc.
I've put a review of it on my website, if anyone is interested: www.itolkien.com
Anyway, at least Decipher seem to be releasing supplements on a regular basis - the game can only benefit from this.