Reviewers largely see Nifty as a strong, mature project management tool with a clean, easy-to-use interface, solid search, useful goal linking, and an API that works well for both teams and solo client work. Several users say it has replaced multiple apps and improved quickly through frequent updates, with the mobile app called out positively. The main friction is around paid Forms, which multiple users describe as overpriced and weak, while one user also says the AI features feel off and remain unused.