One of the main purposes of the sprint review is to collect feedback from the stakeholders and the users on the product increment. Feedback is essential to measure the value and quality of the product increment, as it helps you to validate your assumptions, identify gaps, and discover opportunities for improvement. You can use multiple sources of feedback in the sprint review, such as demonstrations, surveys, interviews, usability tests, analytics, and reviews. You should encourage the stakeholders and the users to share their opinions, questions, and suggestions openly and honestly, and listen to them attentively and respectfully.