We own a Kobo touch (Mrs Acoustic) and a Kobo Glo (7 yo lil'Acoustic). Both are really nice and the battery lasts for weeks considering over 1h a day reading. I bought the sleep cover which puts the Kobo to sleep and disable wifi / touch / backlight when you close the cover. It supports epub aswell as Adobe DRM and is well supported by Calibre. I'm personaly waiting for an affordable A4 e-reader as I'd need it for schematics and technical books.