I have the street version.
I had *all* of the problems with the UP sway bars
Front bar rubbing on the control arm, front bar clunking because of the bushings.
Another thing worth mentioning is my UP bars arrived with chips in the powder coat (presumably from shipping, their packaging was a joke), so they're eventually gonna rust anyway.
By eye-ball measurement, I would say the two holes on the Eibach rear bar correspond to the middle and firm holes on the UP bar; i.e. the UP bar's third setting would be softer.
And don't let me get you down, I'm sure the UP bars are fine at this point. I'm just disgruntled by the whole experience.