That’s pretty neat, but it also is pretty expensive.
Since they’re targeting the wet-shave market, we can compare to double-edged razor blades. If you shave six times a week and use a new Derby DE-blade each time (20¢ ea.), you’ll spend $313 over the course of five years. Half that, $157 over five years, if you use your blades twice (which is still almost identically sharp, if you’re shaving that often). And that’s with a system that uses no electricity and no big breakable gadget.
I’m all for innovation and I hope your friend gets funded. But I worry he’s targeting a pretty small market.
