Reviewers largely see Slack as the default hub for team communication: fast, organized, searchable, and strong at replacing internal email with channels, threads, file sharing, huddles, and deep integrations. Many say it works especially well for remote teams and day-to-day coordination. The main complaint is noise: too many notifications, crowded channels, buried threads, and growing feature clutter can make it feel overwhelming. Some also mention pricing, free-plan limits, and occasional lag or weak video. Makers of and echo its value for keeping teams aligned.