The reviews highlight a mix of positive experiences with the quality of drinks, efficient service, and convenient locations, especially noting the quick ordering through self-service kiosks and friendly staff at certain outlets. However, common issues include long queues during peak hours, inconsistent staff attitude, and technical glitches with ordering systems. Several reviews expressed disappointment over service professionalism, miscommunication about menu items, and some complaints about pricing and wait times. Overall, while KOI maintains a strong reputation for its beverages and modern ordering methods, there are areas for improvement in staff training and operational efficiency.