It depends a lot on the brightness settings. High brightness means it's less visible. Low brightness makes it more visible. Low brightness in low light conditions = unbearable. (My classic: sitting in a cab at night, holding the device in landscape. Scrolling through text then is a pain.) I hardly ever use the device in bright daylight where high brightness settings are useful. My N9 sleeps mostly during the day and lives at night. I didn't find any difference between low brightness with or without powersaving enabled. Also, I don't notice a difference when the charger's plugged in.