I much prefer paper books for technical references. It is much easer to flip back and forth between topics and tab pages for later use. I generally need to have several references available at once making ereaders unsuitable. In my opinion quick navigation and switching between files are the biggest shortcomings of ereaders for reference material.
That being said, I have not had any problems navigating links in pdf and epub documents on my Sony. It may be a problem with the links in the pdf or the sample may not have active links.
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