Since I read that? I think it was the first Heinlein novel I read. It's still on the shelf, though.

I like the portions that are the Excerpts from the notebooks of Lazarus Long. Some good stuff there, Heinlein's philosophy distilled into shot glasses. I don't agree with all of them, especially as I get older, but some I quote regularly.

"Specialization is for insects" is a favorite to this day.

Otherwise...

Typical Heinlein protagonist. Wait, maybe the penultimate Heinlein protagonist. Appears in so many of his books with different names. The "Old Man" archetype, wise, cunning, two or three steps ahead, beloved by men and women alike, all scantily clothed. Money is no problem and outwitting the politicians is a game.

Lazarus is the same character as Jubal in Stranger, which I like, and have read a couple of times, most recently the unabridged version, which adds 60,000 words. It's the most Heinlein novel in his collection.