There was at least one instance of a formula required for some homework problems being found not in the main informative parts of the chapter, but nestled within one of the example problems. Also, it gives a table of element electronegativities that seems to be pretty off for some elements. Overall, I thought it was pretty good even though there were a lot of chapters that we didn't cover. It arrived in pretty good condition with a few non-text-obstructing highlighter and pencil marks.