I have a couple cheap book lights and found them to be what I paid for = worthless.  I was not excited about buying this one reading the low reviews.  It is an excellent book light: full page coverage, light color is easy on the eyes, simple attachment to my Kindle 2 leather cover back, sturdy, flexible and holds it's position, switch works easily and well.  I do not understand the complaints on this light.  I highly recommend this light, as well as the "one battery and one LED" Flex travel model.