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The flip side of my comment is that pros are so good that they can excel with just about any gear and incremental changes don't affect performance as significantly as you would see in another sport like Formula 1 which is dependent on fractions of seconds. Now, will they be able to articulate the differences they feel between the two holders (as is the type of feedback that you're looking for)? Absolutely. But would their performance be significantly different enough to compel a pro to use one over the other? Probably not, but there are many players who are superstitious about their gear and almost never change anything. See: Crosby and McDavid are two of the best skaters of the salary cap era and they skate on old CCM tech.