I'm assuming that Brown before the conversion of the product to the heavily modified functional principle this has been tested at least once. The change is so intentionally happens to 'gently' move the customer to buy a new razor. For me the product is completely useless, every 20 euros shaver with technology from the 80s brings a better result. Artificial obsolescence speak.
I use the product with the old knife block, to buy a new razor. From Panasonic. For this I would advise.