Hello,
There are several reasons for using a DE safety razor. I'll list a few. As far as lasting, that depends on the person. Beards are much tougher on razors than shaving legs. A mans beard is equivalent to copper wiring of the same diameter.
I'm one of those people that tend to get very red and irritated skin when I shave. I also tend to get a pretty painful patch of razor bumps from ingrown hairs resulting from a cartridge razor. Using a DE razor eliminates both the bumps and irritation. This makes me very happy.
I also get a BBS shave, which makes my wife happy.
There is also the ecology to consider. Plastic remains in the earth or ocean, a constant reminder of shaves long past. A DE blade can easily be recycled, or erode with time. I'm not a tree hugger by nature, but this is the only planet we have and using a DE blade makes Mother Earth happy.
Everyone is happy!
The thing is, I'm not telling anyone else what they should use, that's not for me to do. Besides, everyone is different, maybe you a better results with a cartridge, but I don't. I'll stick with a DE blade. Hope this answered your question.
Wishing everyone happy shaving!

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