I don't really think there are any real branding concerns in reality. Its just a font, if it looks good and the license is good, use it !Certainly, those are good options from a licence and technical perspective (huge glyph coverage). But like I already mentioned, Roboto and Droid are designed to be associated with Android, so that makes them a less good choice for branding reasons, just like the Ubuntu font.Best regards, -Stephan
I do agree with your points about adding more fonts. Sure wouldn't hurt. Sean