[jjwiseman]

In 2002 I was trying to use free Lisps in production and finding it untenable due to serious bugs in fundamental areas like network sockets, and terrible support for threads. I was also surprised that implementors didn't seem to take these issues seriously.

It was very disappointing compared to my experience using commercial Lisps like Allegro Common Lisp and Macintosh Common Lisp in grad school in the mid 90s. They weren't perfect, but MCL on a machine with lots of memory was a pleasure I will always remember.