>>17
asdf-install is a bit unportable, I just manually set up ASDF.
The main problem with CL is probably the setup time and large binaries (unless you use ECL), but I don't find either of those bothersome. There's also some minor problems, but if you know CL, it's easy enough to hack the implementation or write your own code that fixes whatever bothers you. These are problems with most languages which aren't too popular, but popular enough to get a lot of good code written for them.