I didn't buy this to read books. I have two of them, and attach them to the handlebars of my 2015 Harley-Davidson Trike (a three-wheel motorcycle).  HD doesn't make a lighted button set for this bike and a number of others.  So far, it has performed wonderfully. The long gooseneck is the real feature for my use, as is the easily changeable AAA battery. I haven't experienced any of the 'flickering' or other problems previously written about.  Those comments are months old and it may well be that the vendor has an updated version. That said, I'm Okay with mine and will keep Alcon posted if I have any problems with them.