Reviewers overwhelmingly say Arc makes browsing feel more organized and intentional, with Spaces, sidebar tabs, split view, profiles, shortcuts, and sync repeatedly praised for reducing tab overload and helping people separate work and personal use. Many say the UI feels clean, modern, and different in a useful way, though several note a learning curve. The main complaints are weaker bookmark handling, performance issues like high CPU, heat, lag, crashes, some extension or site compatibility gaps, and uncertainty about long-term updates and Windows support."