When Rogue Engineering says that not all suspension bushings are created the same, you better f'n believe them. Their site claims that many of the urethane bushings on the market are made of a very soft, pliable
Shore A* urethane. Rogue's are
Shore 75D*, to be exact. (it's all chinese** to me, too)
Now, I didn't think the typical urethane bushing was that pliable but I guess I really wasn't thinking about the forces exerted on the components supported by them. So, looking back on when I helped my friend go ProThane on the 4-link in his Corolla, those bushings really weren't very tough. In fact, they were fairly soft. Of course they were harder than a solid rubber bushing and they definitely made one hell of a difference in the cars feel but...they sure as hell weren't as tough as the rear trailing-arm bushings that showed up on my door-step today.
And holy shit these things are tough. I would have to say that nylon wouldn't be much of an upgrade from these things. I'm pretty stoked right about now, to say the least. The only thing I regret is not ordering some front lower-control-arm bushings to go along with them.
Unfortunately, Rogue Engineering only seems to be catering to the BMW/Mini market but if you're serious about keeping your suspension geometry exactly where you put it when you're pushing your car to it's utter limits, pay attention to the bushings you're installing.
*
Durometer Technical Information
**chinese isn't a language