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I don't use the cloak mode myself. One of my opponents and I banged out 15 moves in each of two games when we saw each other online yesterday. I guess as long as they are willing to play, they will "decloak" and let you see them.
I scrutinize every game played by my opponents I am facing for the first time before I ever make a move. I look for weaknesses and try to exploit them. So, for me, cloaking might be a good thing...
...then I started thinking "hmmm...maybe they will freak out if they see me pouring over game after game..."