xpdf has its uses. I have actually whipped up a web application for use around the office. The user uploads an encrypted, unprintable, copy-protected, or otherwise broken PDF file, and, after a round-trip through xpdf, the application gives you back something useful. But other than such automated uses, I find it infuriating. Many times the on-screen kerning in xpdf is just horrible where it looks fine in Acrobat Reader (example: http://www.analog.com/UploadedFiles/Technical_Articles/49... )
gpdf is missing some key features of acroread. Page rotation is the one I miss most, although "find" is also pretty important. acroread does a better job at scaling bitmaps and line art than does gpdf, and I find it easier to read datasheets or schematics in the Adobe tool.
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