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So I've been forced by circumstances into using @font-face on a site I'm developing, and have to say I'm impressed by the cross browser render quality compared to Google Fonts but it does seem to have a heavy impact on http requests compared to Cufon, as you need four variants per font for body copy and sometimes a couple for headings.
I've generally worked with cufon as I've found it to be flexible, reliable cross-browser and mobile, and despite some odd white-space issues on occasion, easy to work with. I've not done much with the Google fonts as the render sucks in some browsers.
Obviously tech has moved on! How do these three differ, are there any serious pitfalls with any of the three?