Well, trisk is very legible for me at normal reading distance where e.g. proggy or profont feel too squeezed and slightly too small. But ultimately it's also a matter of taste, ofcourse.

Generally screenshots can hardly do programming fonts justice. You have to load them into your editor and try them out on familar code.

Most of the fonts showcased on that page look perfectly fine to me from the images. I only learned that I can't bear an anti-aliased font and about my various gripes with the other fixed contenders because I once went and tried all of them for at least a few hours each.