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Fly on da wall said..
I know a couple of people who tried them. They wasted money as they're very thin and not the correct shape so ended up getting the right bladder as well as going through the process of trying them and buying a valve to put on it.. Cheaper to get the right bladder or repair the original.
The correct shape?? Bladders don't need to be any shape. All they need to do is expand into the void.
They are thinner because they are a different material than your factory bladder. They are also considerably lighter than the factory bladder. It's usually cheaper and easier to get an original but this usually isn't an option on an older kite.