I have the Sway Pro now. I had the Dual Cam previously
-The Sway Pro rides a lot better. It's bars are more "springy" so less shock is transmitted from the trailer to the tow rig
-Sway pro has those nifty rotating chain brackets with a built-in safety pin
-Sway Pro doesn't have any special setup needs like the Dual Cam
-Sway pro doesn't squeal and grind on turns as long as its greased
-Dual cam seems a lot more stable in some conditions. I feel strong crosswinds much more with the Sway Pro when passing trucks (if on the downwind side). The Dual Cam always kept the combination locked together in a straight line. I haven't gotten any sway with the Sway Pro, but never have without weight distribution either. I just feel more solid with the Dual Cam
My Say bro bar-ends (the pivot part) seem to be wearing a little quick. I'm not sure how much slop is acceptable. For a while, it felt like notches were getting worn in, but they turn freely again so those notches must have worn smooth.
My dual cam did have one hitch-head failure where the trunnion socket broke, dropping a bar. Others have had this happen too, but Cequent was good to me on the warranty coverage.
If I did it all over, I'd probably stick with the Sway Pro. It's a little cheaper, and I like the smoother ride.