Ranked in these QuestionsQuestion Ranking
Pro Extremely readable
You can look at the code for hours and hours. The height between lines and the spacing is perfect.
Pro Looks great and is easy on eyes
Almost looks like Source Code pro and works great with Intelli J where Source Code Pro renders all junk on one of the primary IDE.
Very good for people who read code through out the day.
Pro Offers better performance in some Emacs builds
This font is used by some Emacs users on Mac OS X in order to get better performance.
Con Large line height
Compared to other options, Fira has a high line height, which reduces the number of lines you can see on screen at one time.