I'm not actually a font designer. I'm a web developer who's using Glyphicons, a library of icons encoded as glyphs within a font. I'm using them in Bootstrap 3 and they're really great because they scale to any size and can be set to any color, making them really flexible for web design.
Anyway, the icons within Glyphicons are great but there are many icons which simply don't exist and I would like to create my own custom icons. I actually managed to do this by editing an open-source font with FontLab Studio 5 and adding my own custom glyph. Here is the glyph viewed within FontLab:
And this is the result when used in a web page:
For comparison, here are some Glyphicons at the same font size:
As you can see, the Glyphicons look much better, even though they're both outline fonts. I'm guessing there is something you can do to improve rendering at specific font sizes, but I just don't know what I don't know. Any pointers in the general direction would be appreciated.