Grip on the board, what I saw in some videos was they felt sort of slippery while skating. Of course that can be fixed with some pepper XG or mob M80.
Definitely going to give these a try next time I see a pair on sale, almost bought the sour solution ones but they were out of my size
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I sand down my grip when I set up a new board and mostly skate in pretty dusty ditches so my grip isn’t ever really grippy, there’s no noticeable or excessive slipperyness with the shoes for me but that could be related to the way I skate, maybe they feel a little slippery for more advanced skaters.