During the war years, the models were especially popular as they were extremely portable and builders were able to work on them anywhere. Anecdotes say people liked them because they were small enough to take with you, so if you got stuck in a bomb shelter during an air raid, you had something interesting to do.
During the conflict years, these models became especially favored for their compactness and portability, enabling users to work on them at any location. Personal accounts suggest that people appreciated them due to their small size, which made them an entertaining diversion in case of being confined to a shelter during an aerial attack.