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Well, since most of the noise comes from the back, I don't see how they could reduce noise a whole lot.
How heavy are they? I just sent a set of cocomats back because they weighed 12 pounds. That doesn't sound like much, but it is a lot of weight to have in mats! I think the stock mats weigh less than a pound. Of course the cocomats covered the entire floor, and were really well made -- looked great in black and red. I hated to send them back, but when I picked them both up I realized that 12 pound mats were really heavy!!
The cargo mat covers a large portion of the back. Anyway, I didn't order them for sound reasons, but since it has come up on the forum several times, I thought I would try to provide some test results.