I went through various stages:
Standard friction sway bar
Dual Cam
HA
The dual cam was head and shoulders better than the standard friction sway bar.
The HA was that much better again. I wouldn't have believed it if I hadn't experienced it myself. Where the DC didn't allow sway, when semi trucks passed you could still feel the tail move from the pressure wave of the passing truck (actually, flat faced trucks/buses were the worst).
The HA ties the TV/TT together so tightly that the pressure wave pushes against them as a unit. In other words, if it's a strong enough pressure wave, the whole vehicle is going to rock. It's a totally different feeling. Plus, there is zero noise. None of the popping and cracking from the DCs as they jump in and out of the saddles and such.
With all that being said, I'd still be in a DC if I hadn't come across a killer deal on a HA on craigslist. If you watch CL, you will eventually find a HA or PP at a good price. Anything below 800 is a good price, IMO. I've actually bought two, one for 450, and one for 200 (not a typo).
The DC is a very good unit. The disadvantage for the DC is if you change how you load, the DC sometimes has to be adjusted. The HA/PP doesn't. Of course, the HA/PP can be a big more challenging to hook up in certain situations. I have yet to run into one where I couldn't hook up, though.
Richard White
2011 F150 Ecoboost SCREW 145" 4x4
Firestone Ride-Rite Air Springs/Air Lift Wireless Controller
2006 Sportsmen by KZ 2604P (30')
Hensley Arrow