Thats the truth! I'm not sure that Uprated (Polyurathene bushes) are the best idea for all suspension components.
I need to get my large rear bushes done and I'm going to go with Rubber. I'm not sure that poly ones will be good on such a main part of the suspension. There have been questions raised about thier flexibility under stress and this adversely affecting the handling.
Minor joins should be ok and will benefit by it but on my Torsion setup I really need the flexibilty of rubber.