Reviewers say PostHog is strongest as a developer-friendly all-in-one tool: analytics, funnels, session replay, feature flags, and experiments live on the same event data, so teams can move from a chart to the exact user session behind it without stitching multiple products together. They also praise quick setup, flexible event tracking, self-hosting, open-source transparency, and strong value for small teams. The main caveats are narrower: some say the UI and navigation could be more polished, non-technical teams may find it heavier, and a few features still need refinement.