I noticed that setting any brightness on my new 15" mbp that there is no more flickering screen! Also I noticed that when you turn down or up a notch in brightness it seems to have a different effect. Before on the older mbp you would turn up or down a notch in brightness it wouldnt have this subtle effect but now it has some type of effect added to it. Maybe Apple added something new to better control the brightness of the display? This is awesome!