In the testing of this blade I used the Gillette open comb razor. It and the blade are the only things that I kept consistent throughout this process.
I found the first shave with this blade to be a bit tuggy, and not the most comfortable I have experienced. However, with time these blades really come into their own!
I managed to get 6 good shaves from the first blade
@Mark1966 sent me. And I tried for a 7th, I did also change the razor for the 7th shave so I'm not sure if that is a factor to be considered. I found that the 5 shaves after the first were all very comfortable, with no problems whatsoever.
In the next week or so I will try the next blade in the Rockwell 6S and see if there is any difference with this razor. Again with the first shave - of which the first pass was partially completed with the old blade -was a bit rough for me. I will see how it performs with the second shave tomorrow.
At this stage, I don't think these are a blade I would chase really hard for. I think there are better blades that I can get a comfortable shave from the first shave.
All my comments should be taken with a grain of salt however, considering I am still very much learning about different combinations of blades and such.
I did only start to use a safety razor in February, and I am still struggling a little with how to quantify what is a smooth blade or a sharp blade.
Will give another set of thoughts when the next blade is done with!