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I tried one, and it lasted about 2 weeks and I took it off. In theory it's nice to have because you can leave the chain a bit on the slack side, or it can go a bit too slack over time and you won't immediately suffer from throwing chains. As far as controlling chain whip is concerned, they do work ok, but not as well as you might think. It really depends on how strong the spring is. Too strong and it can cause increased chain and sprocket wear. Too weak and it won't really do much of anything other than cost you money.
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