Definitely a game saver for any Amazon FBA seller! This extension not only works out your profits and ROIs, but it also analyses the keepa history graph and provides insights based on the history of sales. It recommends whether you should source the product or not. It also has the ability to add prep fees and calculate VAT based on your VAT status.
The people involved in this development are very passionate business people and provide excellent customer services. Get this extension if you are serious about growing your online FBA business!