I would certainly recommend the Rating Widget app to any Shopify shop owner.
The installation was very easy and I had the ratings appearing on my product pages in probably less than 10 minutes. I only had to add a couple things to my .liquid files. The instructions were straight forward. The developer provides screen shots of the .liquid file showing exactly what needed to be added. There was no need to understand the code either. I appreciate the fact that adding this app does not make changes to my files on its own. I like knowing exactly what is changing in my files.
After seeing how easily it installed and functioned, I quickly decided to upgrade to the premium plan for several reasons. It is a very inexpensive difference in price, once you outgrow the free plan. And for the small cost, I also have the gold rating stars appear with my product descriptions in Google search results. This is a HUGE benefit because it catches the user's attention even when we aren't in the top natural placement position. Also, I am able to access the Analytics to see how shoppers are rating my products - not only per product, but also their overall use of the Rating Widget on a day to day basis.
The ratings adds a measure confidence to shoppers. This is not only because they can see how other feel about the product, but they also appreciate the fact that they can vote themselves. The real benefit comes when upgrading your Rating Widget account so that Google starts showing gold stars when people search Google for your products. And, due to the simplicity of installation, there's no risk to seeing how well it works for you.
As the developer of the App - I love it :) Beautiful ratings for products in just couple of minutes. Enjoy!