I have been using Clojure for years, initially because a repetitive customer mandated its use, later for my own projects because it reduced my development time and is fun to code in. I tried Scala (really liked Martin Odersky's Coursera class!) but it did not stick.
That said, Haskell has started to win my mind share. At least for my own projects I have been mostly using Haskell this year, with some bits of Ruby for quick text processing and munging. When my Haskell abilities improve I would like to start using it for small text processing utilities also.
Sometimes Haskell can be as frustrating as hell (yes, cabal, I am thinking of you). It can be frustrating also when writing a bit of useful code took a while because of the never ending (for me) learning curve. However when I am in the flow with Haskell, it feels like my 30+ years of Lisp experiences, but with a stronger language. It has become a cliche about Haskell's type system guiding you away from bugs, but it is true. I never had that feeling with Common Lisp and Scheme (but I have not tried strongly typed Racket yet).