FWIW, there was an interesting 9 page thread in 2013 with discussion and analysis of the new Sway Pro WDH.
Link Ron Gratz (one of the resident towing gurus) had this to say: "
IMO, the new Sway Pro will not come close to providing as much "sway control" as the EQ or DC do. I would not tow with the new Sway Pro without using one or two friction sway bars."
It would be really interesting for someone to do an actual real life towing test between the Sway Pro, EQ and Reese using the same truck and TT with a detailed technical anaylsis.
All I know is, we have the Reese DC, and I really like it (despite being finicky to set up and all), therefore I recommend it.