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There is a weak link in many of the electric motor controllers used on many of these cheaper lifts both in 2 and 4 posts. There is an electromechanical relay used to control the ups and downs... The companies that use a Chinese made electromechanical relay have issues with the contacts welding themselves together. So sometime when you release the up lever it keeps on going up until it finally hits the safety stop. Oil change shops were getting sued when pickup trucks with tall camper shells were being accidentally shoved into the ceilings. The real high end lifts being sold typically use more expensive solid state relays that are contactless.