New foil shaves several times slower than old one. New foil tears longer beard opposite old one - problem is the foil design, nowdays original Braun foil have the same design. New cutter works well with new or old foil.
The item (replacement kit 31B for Braun Flex Integral) is unusable. In the past I already replaced the foil and cutter kit, but any of my old, worn out used blades are by far in better shape than this supposedly new kit. It simply does not work. The blades are tearing instead of cutting. I will directly trash it. ... Wasted money ..... Next time I'll buy only original spares!