Misspellings aside, the short stories were a treat. It's good to read the characters doing something else and interacting with others. I liked the story with Mahito and the one where Megumi and Itadori are following Gojo around. It was like reading a cut scene from the anime or the bonus page on the manga. 

It's good for a reread. Also, since it's multiple stories you can put it down and read it later.