Ranked in these QuestionsQuestion Ranking
Pro Looks neat
Droid Sans Mono looks beautiful. The only disadvantage is that there's no italics or bold.
Pro Makes code very easy to read, especially if using the version where zeroes are slashed
Feels very easy to read code, even in a very small px (like 10 or 9). Letters are slightly separated, l (ell) and 1 are different, " (opening and closing quote) is straight and not angled, and the "Zero Slashed" version makes it an excellent font for coding.
Con Zero is not slashed or dotted
This can make it hard to distinguish the letter "O" from the number "0".