Personally, probably not too much. You may get some additional insights into the myriad ways that "things can go wrong" (and hence areas that are worthwhile testing). Take a look at the table of contents or the summary card from the book (both on our website) to see if there's anything there that strikes your fancy. The most benefit you might get out of the book is by recommending it to people on your team (or elsewhere in your organization) who do NOT do unit testing, or who are just starting out. Unit testing, like version control and automation, work best when EVERYONE does it.