Do you use them professionally?

It seems to me that very few companies use Lisp-like languages used in production. Even Haskell seems more common.

The big deal with using Lispy languages is that companies don't want to use them -- it's a lot easier to hire developers who know other languages. So, I'm stuck with Java whether I like it or not, and I appreciate any functional programming features that can be packed in to new Java releases, even if they end up being a bit clunky.