I've had the XtraFlex2 a bit shy of two years.  It definitely provides good light to read from the Kindle in a variety of lighting situations.  A great improvement from the 'flashlight under the covers' we used so often as kids.  Cons:  after a while the neck tends to waver and roam to its own tune.  Also the prongs that hold the battery cover in place have broken off.  It's easy enough to use tape to hold it together but a bit tedious when its time to install new batteries.  Pros:  price;  two levels of bright light;  practical and not obtrusive.