First, thanks for linking my Living Common Lisp book. Common Lisp is my preferred language, but only for projects where I need/want an environment that support

First, thanks for linking my Living Common Lisp book. Common Lisp is my preferred language, but only for projects where I need/want an environment that support rapid experimentation of new ideas. If I know how to implement something and I want to deploy at scale, then I might not choose Common Lisp. I am a happy LispWorks customer but I also use SBCL (efficient code, easy to package standalone apps) and Clozure Common Lisp (fast compiler for development).