Reviewers mostly see Arc as a fresh, highly usable browser that makes heavy tab use feel manageable through spaces, vertical tabs, split view, profiles, shortcuts, and cross-device sync. Many say it becomes their default because the UI feels cleaner and more intentional than Chrome or Safari. The main complaints are practical: a learning curve, missing or awkward bookmark behavior, some website and extension compatibility gaps, Windows rough edges, crashes or bugs, and CPU, memory, heat, or battery issues. Some users also worry development has slowed or shifted elsewhere.