Well, as for the pluses, the magnet is really strong and holds the screw tight. However, like most, my oil pan bolt is pointing down. When the bolt came loose and oil started dripping, the oil ran through the bolt, down the flexible hose, down the handle and down my arm. Exactly what I was trying to avoid. On my second car, I unscrewed the screw by hand and poured the oil into the oil reservoir. I used this tool's powerful magnet to locate and remove the bolt from the waste oil. Problem solved.