Reviewers largely see Slack as the default hub for team communication: fast, organized, searchable, and strong at channels, threads, file sharing, and integrations that pull alerts, tickets, and updates into one place. Many say it replaces much of internal email and works especially well for remote or startup teams. The tradeoff is repeated: without clear channel and notification discipline, Slack gets noisy, cluttered, and hard to navigate. Some also mention thread confusion, uneven search for older messages, feature bloat, performance hiccups, and limits on lower-tier plans.