Thanks, you make me feel better for spending the (fun!) time writing my first harness in Emacs Lisp with a ‘Emacs UI’ and later writing a command line harness in Common Lisp. Am I more productive with my own harnesses? Not yet, but the second harness I wrote in Common Lisp is promising, and I might write a little book just on this project to encourage people to hack what I wrote and make it their own.