The replacements blades work basically as well as the original blades. I have no idea if their service life will be as long, but time will tell. The only complaint I have with them is, like so many others, the price. The cost for the replacement blades and foil was over half of what I paid for the entire razor new. To me this is ridiculous. However, since you need the new blades, Amazon it the cheapest place I found to buy them.