The brackets don't do anything that is inherently wrong, as best as I can tell. What is wrong are many of the claims surrounding them leading to false expectations and poor understandings of how things work. The financial cost is low, but the effort to install these things is not low. You've seen the lengths I've gone to on mine for little improvements. I'm not afraid to put myself through a miserable hell to get some small incremental gain that I might not even realistically benefit from. Nor do I glorify these things as being something they aren't. That's where I am on mine. Knowing what I know (about shocks in particular) and in a world where I start over, these brackets are not for me because the payoff for the effort is not there.