I kept a 7570 over 30 years. The switch was a bad contact and I decided to change it. I opted for 7799 in its most beautiful version. I do not regret my choice. Shaving is even softer than the former, although I changed the grids and knives every year, I have the least irritated skin. I felt it with my aftershave he "pique" less than before. Power rinse under water completely without risking the damage is a plus for the trip, when you do not want to take the base. Finally the system that vibrates the grid gives a more comfortable shave even on a three-day beard and even closer than the old 7570 This is the best technology of the moment. I would conclude by saying, calling it 5 stars: A buy eyes closed.