I use my Kobo with Calibre, an open-source piece of software to manage your library. Only had to log in once to the official Kobo account (when I first bought it).
Edit : not as awesome as the long-discontinued Sony e-reader, but I'm perfectly happy with it.
Franchement, j'ai regardé pour faire plaisir à ma môme. Prête à tout critiquer. Et j'ai adoré.