I've never been a huge Williamson fan, although I've read some of his stories through the years. The Humanoids were definitely his most haunting invention. I read about them early on & they've colored my thinking ever since as our laws slowly constrict to make our own world safer. How much is too much?
His Legion of Space had more interesting science than the more popular & easier to acquire Lensman series & were more fun, but I haven't read either in decades, so I wasn't in any rush to read this anthology. I'm glad I got around to it, though. Zelazny got the project together & started editing it, then had the bad form to die. Others finished it & it was a fine job.
Normally I rate every story in a collection of this type, but I'm not going to do that this time. The stories are all good, written by some of the best in the business; LeGuin, Norton, Saberhagen, & more. These icons wrote in another's universe, merged it with theirs, & bared their hearts on how influential Williamson was on their own writing. The stories are great on too many different levels. There's SF & fantasy history, biographical info & anecdotes that are priceless, but they were also just a lot of fun.