This omnibus edition comprises books four through six in the 12 "novel" Sector General series. The series is pulp fiction throughout, increasingly poor as you get further in, but here it is still charming & enjoyable enough to be worth your time. I put "novel" in quotes because the short story-based, magazine-driven, episodic origins of the series are obvious. As, increasingly, are the author's limitations.
He doesn't simply tell you the same things over & over; he actually repeats the same chunks of text more or less verbatim. You will likely tire of reading the same descriptions of the life-form classification system, of individual species, of how Educator tapes work, of the same weak jokes that were mildly funny the first time but aren't at the sixth repetition, and so on. As for the number of times Conway, halfway through a story, is on the verge of solving the problem only to be interrupted, so that things can be dragged out to the conclusion... And that formulaic, to the point of repetitive, structure is unfortunately an inescapable feature of James White's style.
He does successfully refresh the setting by moving these stories out of Sector General itself and into the ambulance ship Rhabwar for books 4 & 5, before moving Conway around somewhat in book 6. His unrestrained inventiveness is not successfully restrained, however, which still leaves a mix of stories, some of which are wildly implausible for one reason or another, some of which are less so. It's easy, light, fluff reading, ultimately. Enjoyable enough in small doses, but the literary equivalent of oddly-flavoured candy floss!