After trying many blades, I ended up with this particular company. Personally, each blade easily gives me three shaves without irritation.

Unfortunately for me, it is 100% a failure.
In a Rockwell R1, they do not cut well at all. On the contrary, they "pull" the beard, so if you are not careful with your movement you will have consequences.
In the same razor, a Muhle blade performed as expected.
It's a shame because apart from the five-pack that came with the R1, I also bought another one.
I tried a brand new blade in the Muhle R89. The result was completely negative. The blade snagged on beard hair even with very good preparation (shower, oil, TOBS shaving cream).
I left the Muhle with a Rockwell blade and continued with the R1 razor that had a Muhle blade which had already done 4 shaves.
Very satisfactory performance.
So, 8 Rockwell blades are definitely going to the trash.

I will confirm that they are not particularly sharp. I also got them along with a Rockwell razor (6c at 3 or 4) but when I started trying, for example, Bic or Feather, the sharper ones suited me much better. I am keeping the remaining blades from the original 5-pack to try with an open comb in the future, but for permanent use with a closed comb I don't see a reason for me.

The worst blades I have ever tried. They don't cut at all, not even on the first shave. I feel like they pull the hairs instead of cutting them. I have experience in traditional shaving, so it's not my technique that's at fault. I usually prefer Feather or Astra.

This does not mean that you will have the same experience—maybe for someone else, they are fantastic. I believe they are worth a try, as with all blades.

I tried them to see how they compare to the ones I usually use. Good blades but I prefer the Feather

They arrived with the Rockwell 6S razor. From my testing, they were just OK overall. It was the first time I cut myself while shaving with a safety razor.

They are not very sharp, and for me, with thick and coarse hair on my face, they didn't do as good a job as the Feather or Bic, and sometimes they pull the hair instead of cutting it. I imagine others, as they write in the reviews, find them very good if you have fine and/or soft hair.

However, for the body and sensitive areas, they are a very good choice without irritation. I imagine they would also be good for shaving the head, although I haven't tried that.

Very good blades! I have been using them for over a year and I am satisfied. Each blade gives me 3 shaves (from 3 passes each) and does not cause irritation unlike the feather ones which are sharper and irritate my face. My beard is moderately hard. They don't rust even when I leave them wet on the machine, nothing at all! From me, it's a YES!!

In a search I did on the internet, the sharpness of Rockwell razors was compared to that of Wilkinson, something that in practice (at least for my beard) is not true.

If, for example, in terms of sharpness, Wilkinson razors are 8/10, with Feather being at 10/10, Rockwell razors are between 6-7/10.

As for irritations, they don't cause me any despite having sensitive skin, while their durability (for my tough beard) is 2-3 shaves. I'm good after 2 shaves and on the 3rd shave, it's so-so, meaning I could have changed the blade after the 2nd shave and not gone for a 3rd shave with the same blade.

I'm not saying that the blades are bad, they're just not for me.