I just installed Koni Yellows with my Eibach springs a few weeks ago. The ride is way better than my previous stock damper/Eibach spring set up (obviously). I would still consider the ride firm, but now it's well dampened. No more of the annoying rebound. And no more front end nervousness around corners.
With the shocks/springs figured out, it really shows the other flaws in the suspension though. More suspension parts on the way!