I have the razor (F7790) now more than two years and was mostly very satisfied at this time with the shave. At the loud noise you get used to shave. The weak point of the razor, the foil sheets, they wear out very quickly. So I had to pick up the spare. This was a mistake, because the durability of the replacement is extremely miserable. After a short time the Scheer sheet formed sharp upheavals that led to Verlätzungen. I broke up with this razor, despite initially good shave and have changed back to the quality standard better and quieter Braun shaver. I would not recommend the razor from these bad experiences out. MfG W.Peter
