It's easy to use; you just hold down the Nook/home button, located on the front of the screen, for a couple seconds and the light pops up. There's a sliding bar so you can adjust the level of brightness--in all likelihood, you'll want just a touch of light, and that option is certainly there. Using the touchscreen doesn't affect the light, since the light is below the outer anti-glare coating. Otherwise it's about the same as the regular Simple Touch, which, by the way, it's not replacing--it'll be available alongside its dark little brother. Using the light cuts the battery life, but not by too much--B&N claims a month of battery life when lit, and the regular two months when dark, so it'll still be a long-lived gadget.