I inherit the 24th version from my father years ago while I was a Tool & Die Maker, he used to call it "the bible" and it really is. However, I lost it during the years. There is almost everything that you need for machinist and mechanical stuff. Now that I'm a mechanical engineer, I bought it again.
Rating: Content rating is above 5 stars, there is no question about this. It may not be for everybody, because it may have more than you ever need, but it's always good to have a reference.
Quality: It's true what they say about the paper quality, you can see a significant difference between editions.