Pretty good, except and I don't share the advice to use package-inferred-systems, like, at all. It hides the third-party libraries you rely on, it prevents you from using one package in multiple files (a flexibility not common out there), you can't see the project's structure at first glance… just use a simple .asd file declaration, you'll be fine.
more: https://lispcookbook.github.io/cl-cookbook/
libraries: https://github.com/CodyReichert/awesome-cl/