4 ms·

Re your edit: they explain it pastes the output of the command directly into your buffer, rather than temporarily showing you a shell with the output.

• lucb1e 6y ago
  Oh, I missed that! Thanks for pointing that out :)
• gpanders 6y ago
  You can just do `:r !ls` to do that. Using <C-R>=system('ls') is way overkill. That said I do agree that the expression register is amazing.