These books are among my all-time favorite. When I was studying physics in college my dad was kind enough to lend me his original edition of these books. It’s probably not fair to compare the physical quality to books that are fifty years old, but I would rather read out of these than the original (and not just for the sake of preserving the originals). I like that the pages are moderately glossy, so they’re nice to the touch without being annoying to read from, and the print and diagrams read very well. So far these books seem to be some of the highest quality of any book I own, and they don’t feel like they’ll fall apart any time soon. Unfortunately there seems to be a growing trend of poor quality printings, so I’m not sure whether I got lucky or if other reviewers just got very unlucky. The only thing that was amiss with the books I received was that their box has a small crack on the back, but this sits against the wall and doesn’t affect my ability to enjoy reading these books. It seems like there’s always a bit of a risk in purchasing books these days, but if I can help put a few people at ease about this purchase, then maybe they’ll have as much delight as I do in owning and reading this one-of-a-kind box set. (And if you don’t get something that’s great quality, absolutely try to return it for a replacement, if possible.)