The PocketBook 515 it was meant to replace was finally retired, so I upgraded. Totally lived up to the hype! Excellent construction with no backlash or creaks. Even after four hours of reading, my eyes feel fine. Despite the fact that it is an electronic card, the grayish paper behind the plastic case may fool some people. I'm not bothered by commercials, so I didn't turn them off. Formats aren't an issue for me because I use the Caliber converter to change fb2 to azw3.