Like many collections of short stories, there's a mix of quality in this one, but some really stand out as excellent 5-star stories, with others being merely entertaining. The opening story, "The Haunted Future" is not only compelling, but does an amazing job at fast forwarding the impact of a futuristic world where worrying about what everyone else thinks and complying to societal norms is far more important than actually being happy and an individual. It's even more amazing considering that it was written in 1959, long before the current day internet and issues of feeling disconnected from people due to the rise of the distance that only interacting with people online has in our current society (already well futuristic to the 1959 Leiber.) The themes and issues the story addresses seem just as realistic a concern now as they did over 50 years ago. In the story, people are constantly undergoing hypnotherapy and drug induced lassitude to conform with a well ordered society, and those who don't fit in are forcibly removed to a city-like asylum. And in a society so tightly wound as this, when people break down, they do so in fantastic style.
"Midnight in the Mirror World" is the other outstanding story of the collection, a pleasant mix of horror and science fiction, postulating the infinite worlds that exist in the recursive spaces formed by two mirrors facing each other. When the narrator notices that one of the many reflections seems to be screaming in horror, he becomes obsessed with understanding how and why...
The other stories in the collection are a mix of entertaining and amusing. The two weakest of the collection actually expand on the Time War setting in the novella The Big Time, but are more vignettes providing an interesting window into that setting without adding stories of much substance.
Overall, a fun read, and well worth the price just for the two standout stories.