I've been really happy with the Equilizer Hitch set-up. I have not used it much yet, but drove from the dealer to home- a six and a half hour drive for me, never having towed anything before.
The hitch was noisey, but solved that with grease on the ball, and where the bars go through the retainer bracket things.
I'm towing a 19' Bambi CCD with a 2001 VW Eurovan and noticed that everytime a semi, truck or any fast vehicle flew past, I hardly noticed any sway, even with my set-up.
In fact, I get more sway from the Eurovan when I'm not hitched up to anything! Interesting.
I do noticed a push-pull sensation at lower speeds- 30 45mph. I can only imagine what this is doing to my Eurovan