My husband is always moaning about the cost of razor blades which is why I was interested in this infinity razor. It is supposed to stay sharp and not need replacement blades. It comes with a replacement guarantee, so that if you think it is not giving a close shave you can send it back for a replacement. You can also try it for 30 days and if after that time you are unhappy with it, you can return it for a refund. I’m not entirely convinced by the claims made in the advertisement, but I think its worth purchasing one to see if it is as good as the website makes it sound.