As with any collection (especially one that collects so many short pieces), some hits, some misses. 
 There are a few pieces in here (maybe 6 or 7) that I've encountered recently in other collections--at least one or two from his M is for Magic collection for teens, and a few from other anthologies and magazines I've picked up. I honestly don't remember where I've seen them before, but it did give an eerie deja vu from time to time. 
 Maybe not the strongest collection in the world (and might be helped, actually, by leaving some of these out, or releasing it as two different books), but even at its worst it was still pretty enjoyable.