Well, got the car lowered a this past weekend.
Front Passenger (right) side needs to settle a bit - These pics are from Monday.
Overall, car is definitely stiffer (25-30%) over bumps, but otherwise much more stable over consecutive corners.
Ride quality has not changed. Still feels smooth as OEM.
One major upgrade is the car's steering; It seems to respond a little quicker, making the car feel lively, and way more fun.
Springs are only temporary. Looking for a full coilover setup soon.