Apps out of date
If I read it right then it seems Amazon have a separate, and longer process for updating apps. This leads to Play Store apps being updated faster than on Amazon and you run into the problem this reviewer did - it tells you that you're using an old version but it's the latest available through Amazon. Awful. I had briefly thought this might be ideal for my mother but this review has pointed out many issues I hadn't considered and saved me the wasted time and possibly money.