Yes and no.
“Downloading speed”: the Cybook appears to a computer as a usb drive and the time it takes to put a file in it is the same as moving a file of the same size to a usb 2.0 pen drive.
PDF in the Cybook is cumbersome, some love it some detest it.
It has several zoom option but does not have reflow of text PDF files as the Sony does.
We are waiting for the new version of the firmware to have it… but just when it comes we will see how good it is. Anyway, it should be something like what the Sony does now.
I have both, the Cybook and the 505 and I keep on using mainly the Cybook, and just use the 505 to read some more difficult business or university pdf documents.