However, I read primarily technical articles in PDF format, and I do not really suited the device.
1. With PDF files, the font size can not scale. Horizontal representation helps a little, but my eyes will soon have no desire.
2. I had looked at the keyboard in Kindle and Co as a waste of space, what a mistake. Without search function is an ebook reader only half-baked.
And finally, the Sony PC software is an impertinence. Transfer to the reader is a matter of luck. Fortunately, there are excellent freeware software Calibre.