We have ran both poly & rubber in the past and have found when running them in a coilover or shockwave setup they just cant handle the weight after time. In our FOX based units the bearings are a kevlar lined unit that doesnt transfer road noise like one would think. As testing goes... Its Fun! I actually put about 800 mile on the 66 chevelle in the video 2 weekends ago on a weekend trip for dealer visits and cruise Indianapolis. You wont find a person that has rid in it that wasnt amazed.
http://www.youtube.com/watch?v=I6XA_P5MB2k
