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The reviews for the Shopify App are overwhelmingly positive, with users praising its ease of use, effectiveness, and the fact that it is free. Users appreciate the options available, the intuitive interface, and the functionality of the app. Many users are happy with the results they have seen so far and express gratitude for the app being free for small-scale businesses. Overall, the app seems to be well-received by the ecommerce merchants who have installed it, with comments like 'works perfectly,' 'amazing,' and 'very easy to use.'