Reviewers largely see Calendly as a dependable, easy scheduling tool that saves time by replacing back-and-forth emails with a simple booking link, especially for client calls, demos, Zoom meetings, and cross-time-zone scheduling. Users repeatedly praise its setup, integrations, and day-to-day reliability. The main criticism is that it can feel limited or awkward once needs get more complex: multi-party or multi-calendar scheduling, fixed meeting windows, customization, and post-booking workflows are common pain points. A few also mention an outdated interface, notification issues, and occasional booking conflicts.