I only get 3 shaves of both the SS and the SS. Looking at how cheap they are I don't care about their longevity. There is no modern blade that lasts more than 5 shaves with my beard. I have much more blades than I would need in my lifetime anyway.I tried one Shark SS and one Shark SC from a sample pack of 5 each. I have medium beard growth, maybe slightly under medium.
The SC gave me 3 good shaves then started tugging heavily on the 4th shave, very bad shave then, they seemed to have dulled a lot.
The SS gave me 7 good smooth shaves, which is what i get from most blades, and i could try one or two more but didnt.
Overall conclusion: the SS worked great for me, the SC performed about half the shaves. In fact of all the blades i ever tried (SuperMax SS, Astra green and blue, Voskhod, Derby Extra, Derby premium, Gillette Bleue Extra, Gillette Platinum, no name supermarket ones (made in Israel on the box), German Wilkinson Sword) it were the Shark SC that gave me the least comfy shaves.
So weird to read some people get so many shaves with those, they must have very weak and soft beard hairs i guess.