It's been thirty years, but two things stayed with me.
1) It had in-universe ghost write-ups, I poured over , reading about class five full-roaming vapors and wondering about the rest of the classification system.
2) I treasured my "Back Off Man, I'm a Scientist" sticker.
By the Official Goodreads Nostalgia rule, I give it five stars. Possibly only four or three if you can't get the stickers.