I haven't turned off the lights yet, but with this TV sized screen - there should be plenty of light for the buttons you push the most. A lot of the actions take place right on the screen, which I'm sure is the way of the future. Thankfully, Korg gives you some hard button doubles for those who still like to feel plastic beneath their fingertips!
BTW - Sweetwater got my 900 the same day that Frankie posted that he got his. Just sayin...