I found this book to be plain. The stories were very mediocre. Even the story by Orson Scott Card was the least entertaining short I have so far read by him. I liked certain parts of a few of the stories such as those by Frederick Pohl and Dan Simmon's Hyperion story was a pretty decent one. Overall, as one who enjoys short stories for their windows into brief imaginings, most of these just fell flat to me.
Some great new stories connected with epics previously published. I particularly liked those by Orson Scott Card, Frederik Pohl, Greg Bear.
This is a must-have for any sci-fi fan. It has many beloved authors revisiting their most famous works with all-new stories. A great read!