The discussion on this answer to the question \"How can I use Google\'s new imageless button?\" Has prompted this question.
Google seems to think that going imageless i
I think in this specific case I can only see the advantage that the buttons can be programatically generated. If you don't know what your button will say it's probably easy to make this way than generating it using somekind of image library generator.
Also changing one CSS can make you change the look-and-feel of all buttons at once. Using image buttons you'll need to update everyone and each of images.