The first thing that must be said about this book is that it is a typesetting disaster, truly the worst I've ever seen. It's as though the stories were imported from one type of file to another and never proofread thereafter. Consequently the book is strewn with spelling and punctuation errors, literally hundreds or thousands of them. This is a great pity as Malzberg deserves a more fitting testimonial than this.
In terms of the stories themselves, there is plenty of interest here but I doubt this can really be called the best of Malzberg. There are classic stories here that were later expanded into the novels The Men Inside, The Cross of Fire and Galaxies. Some of Malzberg's best stories of the seventies are featured here but there's a welcome dash of newer material too. Truthfully, I found a number of these to be too oblique for my liking. My favourite type of Malzberg story now are his alternate histories of famous personages, especially his alternate presidents stories. There's also a gem of a story called 'Corridors' which first appeared in The Engines of the Night.
All up, I'd recommend that those wanting to read Malzberg's best short fiction source a copy of Arkham House's In the Stone House, which I believe to be a stronger collection overall and free of typographical errors too.