Mach3 is I find great ...

I can not say exactly how long you can use the blades but keep them until they no longer have to cut and start to pluck some time clean. The strip at the top shows slowly when you should change the sound, this one has done better in the sense I find and you can tell that they are dull. So I buy them for years and they will continue to prefer. With shaving cream to slide perfectly through the skin and I can not complain really. I hope they are still far from the assortment!