Both programs are good to have. I would suspect that except for purchasing DRM books from Sony you would have little use of the Sony software. Calibre is a complete package for the non-DRM world. Those of us with the older Sony model (PRS-500) needed the Sony software for its USB driver that would allow the unit to be charged from the USB port. (The 505 and 700 do not need or use this driver.) The Calibre driver in those days did not allow the unit to be charged through the USB port.
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