Excellent. All hail the Wickham. Used this as a resource as I was trying to re-implement an existing hand-tooled package that I wrote a few years ago with nothing more than a text editor. Now I'm using RStudio, devtools, Git and GitHub, Roxygen2, clearing all the checks with not even notes, and I'm feeling much better about being able to confidently enhance the package going forward.
There were a few issues that kept me from going to five stars (mainly around when you follow the instructions, and things don't work), but overall, if you're building packages, this is pretty indispensable.