Of the new dampers I now expect easy times more stamina, especially actually three years serviceability are promised. Although the defective were formerly selected and installed according to the flap weight and the manufacturer's selection tables, I now have the lifting capacity increased slightly, from 320 Nm to 380 Nm and hope that the "muscle strength now sufficient permanently over the years. Increased lifting means but at the same time that you have to use more force to close the door so you need to take 320 Nm now 380 Nm overcome and this is clearly noticeable.
From my experience this out so I'm careful with praise or blame. In 3 years, I can say more.