Ranked in these QuestionsQuestion Ranking
Pro Best legible font
This font is legible in every condition.
Pro Clear and dis·tin·guish·a·ble
Code is very readable at both big and small sizes.
Pro Beautiful with high pixel density
Pro Looks good on low and high PPI displays
SF Mono looks good on external monitors and Retina Displays. Large and small font sizes.
Con Slightly difficult to use outside of Xcode, Terminal, or Console
The typeface isn't available in Font Book, etc. unless the user imports the files embedded in the apps above.
Con Apple is locking down this font
It's not open in any sense of the word. It even gives warnings if you try to rip it out of the Terminal.app or Xcode bundles. Obviously, Apple only wants it on their tools. This is such a shame. It should work in other editors, too. It's a beautiful font. Apple open sourced swift, why can't they be open with a monospace font?
Con No Ligature Support
Does not support Ligatures so it doesn't play well with some terminal themes.