Summary: After purchase I noticed a huge difference in the quality and closeness of my shave. I have had my original foil and blade set from my purchase back in 2009. I oiled and cared for them regularly, but like all things wear-and-tear created tears in the foil and the blades just were not as sharp. Think of this purchase like changing your toothbrush after a period. You are going to be amazed how much a new set of blades makes a difference.
Summary: It felt like my shave was not getting very close with the old blades. So I replaced them and while it didn't make a noticeable impact on how close my shave was, it did "feel" better during the shave.
Summary: After 18 months with the same foil/blade combo, I didn't realize how dull they had gotten until I put new ones in. Wow! It makes a huge difference. If your shaver is taking longer and longer to give you a good shave, consider this to bring it back to like-new condition. I only wish they were less expensive - the parts don't look like they cost that much to manufacture.