I finally got them all installed yesterday, and I they seem to be a very good spring for the street. I REALLY like the fact that lowering the front that little bit more has improved my rear view mirror visibility. No more strobing headlights from behind as the car undulates.
I still have the stock uppers. The ride is definately only slightly more firm, but much of the rubbery feeling seems gone to me. It feels like I lowered the car allot more than I really did with the improvement in roll resistance, and the handling balance is definately more toward the tail-happy nature that I was looking for.