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I've never really explored the native grep functionality, so its possible I'm missing something.

The two features I really like about fzf are

1.) the preview window (visible here https://github.com/junegunn/fzf)

2.) Fuzzy finding/multi-selection/gradual refinement of search terms

Nope, you're not missing anything, then. Maybe I am -- I use the fzf plugin, but only for finding files. Is this (build_quickfix_list) what you're using? https://github.com/junegunn/fzf/blob/master/README-VIM.md#ex...