The line spacing in Meslo LG makes it very powerful and gives it an amazing look. The font is especially clear for reading code in Eclipse or Intelli J.

A patched version for Vim Powerline is easily downloadable and comes with additional glyphs.

The style of characters avoid ambiguity by making every character distinct. For example, a lower case "L" and upper case "i" are unique such that that it cannot be confused, even if you're unfamiliar with the font.