Hello everyone. I am wondering how to gauge the quality or consistency of DE blades. For example I have sensitive skin and use a Gillette Tech or Lord Merkur Tech razor most of the time, so would it not stand to reason that the redbox Personna blade would be my "best" match? I say that because as I understand it...over all the redbox IP's are considered gentle...right? Why does the very sharp Feather blade work so well for me then? I got a wonderful close shave today with one with no irritation, burning, or redness. Is there a way to determine if a DE blade is going to work for me without trying it out first? What other blades are like redbox IP's? What blades are similar to Feathers? Thanks for the help to a bunch of questions.