My only problem is that I have trouble finding titles the credits are good on that I actually want, although I'm really happy that the selection is not the oftentimes rather lame selection of only titles published by Amazon. But still, I'm not into some of the categories in the Great on Kindle list, like biographies or religion. I do like history though and have found a couple of titles in there, and also one title in the business section.
My expiration date has moved out a couple of times as I've used some credits and bought other books that generate credits. I've never been quite sure how the expiration date is determined, but I haven't come close to having any credit expire yet.
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