FWIW, I use urethane bushings everywhere in our Pantera's front & rear suspension, except for the Koni gas shocks which use steel rod-ends in place of bushings. I noticed an increase in handling precision but no noise increase or ride harshness over stock rubber, which surprised me. But there are various grades of urethane available, and I've not checked the durometer of our bushings.
If you use rod ends/heim joints anywhere in your suspension, I suggest you add rod-end seals- available cheap from Speedway Motors in NE. They are used by dirt track racers on their rod-ends and should increase the operating life of your fully exposed rod-ends on the street.
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