The best I’ve seen for this task

This plugin seems to be as good as it gets for displaying Amazon reviews. Setup was simple and easy. It maintains the look and feel of the Amazon website, which I think is psychologically very important in winning the confidence of the reader. I and many other users wish that it would display more reviews and/or allow them to be sorted by ‘most helpful’, highest rated, most recent, etc. However, the Amazon API does not allow that (how like Amazon). I checked that with support and read it in other support requests, also. I doubt that Amazon will ever allow such sorting, but if they do, I’m sure it will be included in the next update here. BTW, the support response was very fast and on point. I would recommend this plugin to anyone.