"Chemical Guys Carbon Flex C9 is the world’s most advanced hydrophobic protective coating."
So what they're saying is not that it's the "most hydrophobic" (which can be easily tested and compared), but basically that it's the "most advanced coating" that just so happens to be hydrophobic. Which is a much more subjective statement without knowing the exact chemistry of the product. Second Skin 6 did not leave behind any sort of impressive water behavior from the tests that I've seen, so now it looks like they're going to deliver on the demand for stronger water behavior. $150 for 30mL is still more expensive than most of the other coatings that consumers can get, much more than what I want to spend.