During the Golden Age of Sci-Fi writing, (I'm thinking 1950's - 1960's), there were lots of writers who, in addition to their longer, serious work, liked to pop out a short story with a joke or twist or otherwise surprising ending. Asimov would do it with gusto, but probably the high point of this sort of thing was Arthur C. Clarke's "Tales From the White Hart", tall tales told by Harry Purvis in the White Hart pub and usually described by reviewers as delightful, outlandish, geeky, unexpected and either plausible or implausible, (depending on whether they got into the spirit of the thing or not).
Anyway, all of the Haynes shorts I've read, ("Uptown", "Sleight of Hand", and "Off Course"), are reminiscent of those sorts of tales. There's a set up, a build up, and a payoff. "Off Course" is the lightest, "Sleight of Hand" is the jokiest, and "Uptown" is the most developed and trickiest.
However you weigh it, it's nice to have someone observing the old conventions, and occasionally just playing around, with a wink and a nudge. If you like sci-fi that isn't too full of itself and like tasty little snacks, all of these stories strike me as worthwhile worthwhile.
Please note that I found this book while browsing Amazon Kindle freebies. I have no connection at all to either the author or the publisher of this book.