Do fast track services at Don Mueang Airport actually speed up immigration processing?

Users reported that fast track services at Don Mueang Airport can expedite the immigration process, allowing travelers to use a separate line. However, some noted that while the process might be quicker, it may not lead to a smoother experience, especially if checked luggage is involved, as that wait remains the same. For a truly smooth experience, it was suggested to book 'safe entry' through a visa agent rather than relying solely on online fast track services.