In my experience (Clojure and Clojurescript), LISP is a powerful tool for quick prototyping and experimentation as an individual hacker.
The REPL-driven flow can get you far very fast.
Add a couple more experienced hackers to the mix and you can build something great fast.
The downside is that it's a difficult tool to become fluid in and so it's difficult to find experienced hackers, so scaling the team is going to be slower than with other, more popular languages.
The downside is that it's a difficult tool to become fluid in and so it's difficult to find experienced hackers, so scaling the team is going to be slower than with other, more popular languages.