"Jerry Was a Man" is a lesser work, but interesting in that it argues that humanity will constantly have to revisit the slavery thing as our abilities to create non-human servants will outstrip our wisdom in their use. Maybe old hat now, but it wasn't in the 1940's. I'd be willing to be large sums that whoever wrote the Star Trek:TNG story about Data being, leagally, a Man, had read this once apon a time. Very similar viewpoints.
The other two stories are among Heinlein's poorest and keep this from being a 5.
The reason I bought this book is for a story that deals with transition. "Lost Legacy" (1941) I do not want to go into too much detail as it is fun to have the story unfold in its time. However the story speculates as to what the so-called unused portion of our brain is for. Heinlein is not the first to speculate, but he does put together a great story combining many previous speculations.
While enjoying his story, look at the rudiments that will be used in later Heinlein writing, [Stranger in a Strange Land] ISBN: 0808520873 (see my review May 22, 2000). Even some of the names are the same.