I've been slowly working my way thru a bundle of blades a friend sent me about a year ago.
Slowly because I only shave once or twice a week (blasphemous of course, but SWMBO likes the stubble), and I alternate between my 1961 Super Speed and a 1940's Tech.
Well, I've gone thru Wilkinsons, Derbys, 7 O'clocks, and... well... I was feeling a little like I had a two digit IQ or something. I could never really tell the difference between blade brands - although thankfully I could distiguish between the two razors loaded with the same brand of blade.
Finishing up a brace of 7 O'Clocks, I reached into backstock for the next candidate.
"What came to the top of the pile?" you ask?
Ya, yoo-betcha... the Feathers.
Loaded one in each razor and had at it with the SS.
"Holy SHIT, Batman!!!"
I had weepers galore, even though I'd been careful to use zero pressure. Overall, the shave was terrifically irregular - caused mostly by the shock of the operator, I'm sure.
Most of all, I felt a strong regret that I hadn't chosen the milder Tech for the first test drive.