I'm a recent clojure convert too (haven't used clojurescript much).. I have to say, the only thing that annoys me about it occasionally is its marriage to the JVM. It took a few months to get into it from a C++/Python/Go background, but now, hacking in other languages (maybe less so in Python) feels like sculpting while wearing oven mitts - needlessly tedious and overwrought. But, to make a unit test by coding the function, making a lovely structured literal of the input data, running the function in the repl, and then pretty printing the hand-verified output to paste in as the expected test result is just the least effort I can imagine for that kind of coding process. I'd count myself as happier if every language had as strong a system for printing and reading in data literals.