Anti Sway Systems - Necessary or Marketing Con?

My Blue Ox hitch is supposed to have a level of anti-sway built into it. On those occasions where I have had to swerve or brake hard I never had an issue. However, I am only pulling a 25 footer at about 6000 lbs. with an F-150 E-Boost.

As for how fancy a vehicle you need. In my younger years I was told that a Chevy cost the same as a Cadillac only longer. ;)