I've read all of Heinlein's books, and this is one of my favourites. It's interesting as a period piece (turn of the century onwards) as well as a fantastic set of memoirs of Maureen Johnson, mother of the infamous Lazarus Long. If you haven't read any of Heinlein's other books, you might find things a little confusing in places, but it's still very readable. If you have read any other books by Heinlein, then what are you waiting for? All (or nearly all) the best characters are in this book. It really wraps everything up nicely.