Psstt.. it works! Just try it out, its not like you have much of a choice if you want to use your Shimano wheels. I have been doing it for years and still do it to this day, sure its not always spot on but it beats buying all new wheels or changing all your cassette body's and cogs. But don't tell anyone or they'll say it doesn't work but it works. Some even go as far as to grasp the "it will wear out earlier than normal" straw but they aren't doing it so they have no data on that, but I do! Its wears the same, just as long as you lube your chain as you would normally do and clean it, which is what you should be doing even if the brand matched up all the way.