I bought this light exactly a year ago and I am still using it without any problems. It fits nicely on my ereader and it is very easy to change it to the right angle.
Batteries last long, only the light deminishes when power is getting low (which is normal, I think). It provides enought light to read by.
I'm still very happy with it! :)
Edit: Aw, I dropped it, now it's broken. Ordered a new one...