APL Worth The Effort

Hi, Does anyone here think learni ing APL is worth the effort, I know a few people who revere it as the optiomy of programing but im skeptical. I have a pretty strong background in functional languages (Haskell, CL , Clojure, Scheme, Qi , etc.) and have read my SICP so its concepts shouldnt be too hard for me to learn but I want to know what makes APL 'special' and when it comes down to it useful.

I might try J first. J is a version of APL which uses only ASCII characters. I tried out J for a few days and I liked it. Though one problem being that it's almost a write only language and you have to keep at it for a while learning the vocabulary.