I’ve been using this razor for a good 5 years or more and I’ve never failed to return to those refill cartridges as they are the best and provide the smoothest shave. I’ve tried others that I’ve picked up at the drugstore when I’ve not had my handle with me and instantly regretted it. These razors are the best and I highly recommend purchasing and using with your favorite cream or oil to get the closest shave with no nicks.