As part of the Kickstarter for "Tome of Beasts", I signed up for the PDF of the accompanying Lairs book - a collection of short adventures showcasing monsters from the book. There are Lairs books for both "Tome of Beasts" and "Tome of Beasts II", and indeed for the "Creature Codex", but I haven't looked at any of these books previously.
The adventures themselves range from levels 1 to 12. They're all short, intended for a session or two of play, with a 5-room dungeon (or a little more) at the centre of each. Each features a small handful of monsters from "Tome of Beasts III", with some also drawing monsters from the SRD (or Monster Manual).
As might be expected, the adventures are something of a mixed bag. They're all functional, if rather basic, adventures. None of them are terrible, none of them are really spectacular, though some few do seem rather dull. That said, if needing a quick adventure at short notice, or if particularly looking for something to use monsters from ToB3, these are decent.
Ultimately, though, this book hasn't inspired me to go looking for the other Lairs books, and I'm not particularly inclined to recommend this book. Certainly, it's a companion volume for ToB3, so this is one to avoid if you don't have that book. If you do have that book, this one is worthwhile if you're looking for a set of short adventures (which, to be fair, is a useful thing to have - provided you don't already have a ready supply of such things). And, of course, if you are offered a good package deal then this may well be worth looking at.
So that's a somewhat ambivalent review for that one. Make of it what you will.
(Note, though, that "Tome of Beasts III" itself is something I regard much more highly - whether you go for this one as well or not.)