+

• Easier to write
  • No need for { } (also ;, but it can be argued that there's no need for it in JavaScript either)

-

• Tooling compared to JavaScript
  • No proper linters
• Readability?
• Getting new features from ES6/ES7 to CoffeeScript will take a long time
  • No async or await
  • Missing ES6 module
  • No dynamic keys in object literal {['a' + 'b']: 2}
• Will the project be continued when ES6/ES7 implements a lot of stuff previously only in CoffeeScript
• https://github.com/clutchski/coffeelint/issues/20#issuecomment-124893644