When I started learning CL from Practical Common Lisp, as is preached in the book, I started off with Allegro CL compiler. I stopped using it, since its commerical, yet free bit didn't impress me. It needed a connection to its remote server for some licensing stuffs.
I switched to 'clisp' and am using it. Now, I have been hearing about SBCL and planning to start using it as well.
So, the question is: How do the various ANSI CL implementations differ? Any practical experience of using one over the other ?
Thank you.
See Common Lisp Implementations: A Survey by Daniel Weinreb.