The Libra is only OK for small PDFs. I use my Lenovo 10" for magasines and datasheets. Some old scanned books are small enough for the 6.8" Mars, which has auto-crop and settings to remove watermarks and make background white. You'd need to preprocess PDFs or install a 3rd party reader on the Libra, even then plenty of PDFs are too big.
Small instruction books/manuals (A5 size max) are OK on the Libra. The libra is one of the best for ebooks. Screen size and of features on the PDF reading is an issue for PDFs.
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