Just installed Gen IIIs yesterday. Feels good, the front end feels tighter all-around, and the steering response is a bit quicker. But, I would NOT call it a "night and day" difference. I noted NO increase in road harshness or vibration... honestly, I think there's less. The old bushings all looked worn, but they were still there and doing their job.
I reccomend the Gen IIIs. One thing, however, is if your stock bushings have the four nuts holding on the lower bushing, do NOT strip one!!! I managed to round off a nut and spent 4 hours first ripping the bushing out from under it and then cutting the metal away at the end of the stud to pop it out the top. headbang It was ridiculous, the rest of the bushings went real quick, like an hour.
I've never ridden in or driven a car with aluminums, but if you have any questions about the Gen III's please feel free to e-mail me. thumb