Across 7 verified merchants and agency operators, 79% are satisfied with Back in Stock. The return is unusually concrete: one merchant says it pays for itself ten times over monthly, another reports some brands seeing 20% of revenue from restock alerts. The mechanism is simple — capture demand on sold-out products, notify automatically when stock returns — and batching notifications by received stock quantity prevents overselling. A secondary benefit reviewers value is the signal it provides on what customers want you to remake. The criticisms are about polish rather than function. Several describe it as a barebones system with a dated interface, and want more freedom to style the sign-up button to match the brand. Reporting gives high-level numbers without daily signup trends or demand spikes, one merchant hit trigger failures after the app changed hands, and another missed sending opportunities because there was no warning that a plan upgrade was required. There's no account manager, only email support. The verdict: one of the highest-return apps in our data, and rough enough around the edges that you'll notice. Most merchants decide that trade is easy.