This is the sixth volume of Flint's project to get Schmitz back into print. The seventh volume is a reissue of The Witches of Karres, and with that, everything that Schmitz ever published is back in print.
This was the book that I took to cons and such for a while, and it was the book that I read in the airports on my Ecuador trip. I finished it when I got back. This isn't the best way to treat a book, and my impressions may not be the clearest.
If you've read the previous volumes of this series, the quality of the stories is similar. Generally good SF stories; the tech is for the most part kept vague enough that it's not too badly dated despite many of these stories being 40 years old. Plot is generally solid; characterization is often a bit weak, but not too terrible. The individual stories are reasonably engaging, but seldom really spectacular. Anyone who's a serious SF fan ought to read some of the Schmitz stories; once you've read one book, you should know whether you like his writing enough to pursue the rest. I give this one a 7 out of 10.