This was the blade I used on my 1st DE shave, as I got a pack free with my razor. The shave was rubbish, but I put that down to my technique rather than the blade.
A few years down the line and I received another free blade with a recent razor purchase.
I popped it into my HD and went to work. Like other posters on this thread I found the blade to be nothing special. Certainly duller than my usual Feather blade, but not so dull that I felt like I was dragging the razor over my beard. Maybe comparable to a supermarket Wilkinsons Sword blade.
2 passes got me over the finish line with a little redness on my neck. I used to get some irritation when I started using the Feathers, so am not overly concerned with that.
I notice that on Connaught shaving they cost more than Feather blades, so on that basis I wont be buying any.
To conclude, I find the Merkur blade to be just OK. I am not one for rotating blades so will not be making the switch over to these.
UPDATE:
I popped the same blade into my Futur this morning for comparison.
It was BLUNT. Really had to pull the rasping razor through the tough hairs on my chin. I soldiered on for a painful 2nd pass. But I knew that I was doing damage.
Now I have a sore, blotchy neck. For a one shot blade (YMMV) these are poor value for money.