Summary: I use them for at least 45 shaves, but I use it in the shower. I have not had a problem, but I run it under the shower before cleaning it. Using it dry may cause the cartridge to get dirtier faster.
Summary: I love my razor and use Neutrogena Men Sensitive Skin Shaving Cream. So I only have to clean my razor with the machine a couple of times a week. This makes it last 3 months instead of one
Pros: I bought my razor at one of the national retail stores, but they don't carry the Cartridges. I checked around and none of the stores sell the razor carry the Cartridges. I really think that's wrong. Thank you Newegg for carring them.