I don't read short stories very often and most of the collections I read had some excellent stories mixed with good, regular and really bad ones. With "A Land of Ash" things are different. Every story in here is at least satisfying but most of them are very good and some excellent.
The subject is the same, the Yellowstone Caldera eruption (which I don't know if it'd be so devastating, but in my opinion, that's not the point) and the stories show the human nature and behavior during/after this catastrophe in many flavors, varying from love, kindness, hope, indifference, guilt, selfishness, desperation and violence. Some stories are bleak and more on the dark/pessimistic side of the humankind but I think the collection, as a whole, summarize a good amount of different possibilities for us, readers, to reason about.
Just to make things clearer about my taste, even not reading much short stories I do like them and I also like post apocalyptic tales. If you got similar likes, go ahead and get the book. It's not long (11 stories in less than 130 pages) and very worth reading.
(review of free book)