The comments sections are filled with clues.
You will find two types of comments. People who love the product and people who hate it. Both are extremely useful to you.
People who love the product, the four and five stars, will tell you why. What features they liked and why that was so important to them, what issues it solved. All the copy points you need to convince someone else. They can write your Amazon copy for you.
The negative reviews are just as useful, listing pain points, all the things you can take away from them with your product. From the negative you can construct a positive promise.
The comments reveal the emotional transformations you consumer goes through.