Okay I've had a quick 1 pass shave. Comfort-wise it wasn't gliding like my 2022 Astra SPs at all (you call that harsher I assume?). Cutting-wise it cut OK.
Note that I'm a newbie shaver so I'm nowhere qualified enough to compare & contrast blades. Also it was a very quick shave so lather was insufficient my hair didn't get soft enough.
I have slight irritation.
Insufficient lather? That could very well be the reason your shave was harsh. Give them another try with properly built lather.