This book is as good a collection of Aldiss short stories as any I have read. Yes, it's less experimental than The Moment of Eclipse or Last Orders but I found it to be poignant, enthralling and often quietly profound.
Many of these stories aren't science fiction or fantasy but have a fabular quality nonetheless. The flow of time is a theme that constantly occupies the characters in these tales: change, whether for the better or worse, personal development or decay, the transience of human schemes.
Among all the stories, two stand out for me. 'The Girl Who Sang', the longest story in this book, is a wonderful adventure, a mini-epic, beautifully written.
As for the other masterpiece, 'The O in José' is neither a fantasy nor a realistic piece but exists in a genre of its own. It is philosophical and cosmic but also grounded, and it has an unforced twist ending that is gentle and powerful at the same time. I regard it as an example of a "perfect" story. In other words I don't see how it could be improved.