its not a question of expense or not changing blades, just a thought. I haven't used my slant for a full week yet so I have no idea, but I do notice the shaves are different and the razor cuts quite effortlessly so I was wondering if there was an effect on blade life as well.
I can say that it does turn some blades that I did not like into good performers .
As for the blade lasting longer - I did not get that from my use with the slant .