Arkham Reviews has written wonderful, detailed review of Snow Bunny and Snowball.
You can read the whole review of Snow Bunny here.
Kim Dyer’s earlier review of Snowball.
I was especially glad to see that tiny aspects of Snow’s early adventures – such as the construction of the hovercraft – were really significant later on. For the last third I was on the edge of my seat as the thrill of the rescue mission just went from peak to peak. Zeman has a particular knack for writing gripping action sequences that really make use of Snow’s ability to rapidly change form.