I thought I would try this as it was very cheap and I noticed a lot of top players use something like this to try to eliminate wolf tones. I must say though that I am not convinced that it makes that much difference, but I can't tell if that is because it is not heavy enough or for some other reason. It was worth a go though and I do still leave it on.
This wolf eliminator is ok and a cheap option, not as effective as some eliminators though due to its lack of mass. On the plus side though the rubber sleeve is kinder to strings than other systems and there is minimal interference with string tone. If you have a wolf note that isn't too bad this is a good choice.