5 stars for the Gummitch stories and the novella, Ship of Shadows, 3 stars for the rest of the stories, and we shall never speak of the poems again.
I first read "Space Time for Springers", the best Gummitch story, back in the 80s, in a collection of cat SF/F stories called Magicats. I had no idea there were more Gummitch stories until Andrew Cartmel (author of the highly enjoyable Vinyl Detective series) mentioned them, and this collection, in an online conversation. This book is hard to find and expensive when you can find it so I had to wait to move to a new city before I could find a library that had it in its holdings. Thank you, Andrew!
The stories are definitely old school (50s-70s) science fiction, with all the charms and occasional now-cringey bits emblematic of the time and genre. Ship of Shadows took a bit to get going and make sense but once it does, it's a ride well worth taking, as the Hugo it won attest to.