Across 5 verified merchants and agency operators, 90% are satisfied with Checkout Blocks. It was among the first movers in Shopify checkout extensibility, and reviewers value the level of personalization it enables without code — adding content blocks to thank you and order status pages, custom fields like delivery notes, and control over which payment and shipping methods appear in given scenarios. One reviewer is simply relieved an app finally exists to add basic elements like a text box to checkout. The complaints are commercial and situational. The sharpest concerns pricing structure: one merchant objects that revenue-generating blocks sit behind paid plans, particularly given Shopify Plus costs rose 25% on the promise of added features. Certain unique use cases remain impossible, though one reviewer considers that fair for a free app. Another notes no quick solution emerged for upsell discounts after Shopify Scripts was deprecated. The verdict: the free tier alone justifies installing it for basic checkout customization. Whether the paid blocks are worth it depends on how much revenue you expect them to generate.