My no is an absolute, and there is no such thing with such a subjective question, so I should have qualified that statement.
For me, I did not see any difference in the flavor of the foods I cooked. I also did not have issues with temperature variant's on the grates, so I did not see any real change in those readings. But...The data showed that the Hurd downdraft did decrease pellet consumption on my Daniel Boone by 7%!