Discovered that series when I was a kid...loved it!
I rediscovered Jaime Retief in my fifties and recommend it highly to older adults.
Great juvenile Sci Fi holds up well, as a rule.
As a child I enjoyed the action and thought the "professional" behavior of the characters silly.
But now, I've dealt with so many Pouncetrifles, Dimplicks, and Groaci and Boge, over the years that it's the broad exposition of the "professional" behavior of the characters that I most enjoy.