I started using Review Fetch before there was a Shopify app. It was great for capturing and displaying Amazon Reviews, but I wanted more.
Most importantly, the app added the ability to get reviews from my shop's customers. Another great new feature is uploading reviews from other sources.
The app makes installation ridiculously easy. Before the app, installation was complex. However, they provided great support to help me through it.
I love both the app and the company.