Found it in one of the many still-packed boxes when searching for Cohen's "Beautiful Losers" since I was heading for the pub. Vagually remember buying it at a secondhand-book market or the like. It's old, pretty thick, and I'm quite curious about it.
Lately read some articles indicating with how much esteem Heinlein is regarded. I knew he is good, I knew he is one of The Great SF Writers, but it seems he actually occupies the upper echelons. Forgot which book of his is supposed to be the ultimate masterpiece.