Update: The yellow (sport) Konis are installed and I have a couple of weeks of driving with them. Here are my impressions.
1. Ride height is pretty much the same, which is fine by me. The Eibach-lowered height is much better-looking than the OEM height.
2. The front Konis are set to full soft and the rears are not adjustable.
3. Even at full soft, the ride is still very "aggressive" which to me means that it is very firm and buttoned down - no side-hopping at all.
4. Rebound is improved, making sudden steering changes more like a track car - very little tipping/rotation of the vehicle. This makes it feel like it is more in control at all times.
5. If you drive sedately, Konis won't change your experience much.
6. If you like a smooth, comfortable ride, don't get Eibach Sport springs. I happen to like a more sporty feel and this combination definitely satisfies that need. Of course, the 17.5-lb each Enkei PF01 wheels enable enhanced acceleration, more road feedback, and better braking.
In other words, it's like having an M3 that is focused on having excellent handling + excellent fuel mileage. Better tires are on the horizon.