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So, NL. Do you have the impression that far from degrading with use that Karis M almost gets better over time? I am starting to suspect it. Or maybe that it has a fairly extended break-in period?
I think the topsheet grip actually goes away/gets a little worse but since it isn't the dominant element in how the rubber produces spin, you don't care about it. The mechanical grip is surprisingly stable and after getting used to it over time and rebuilding your technique for deeper impact, you get good at producing good shots with the rubber. And then when you get a new sheet, you start off trying to relearn how to deal with the annoying topsheet grip that you spent so much time ignoring. The sponge possibly softens up a little as well with more ball impact.
I am testing Karis H sometimes this week. The rubber feels like a stone. Early prospects aren't great.