Dunno if this is valid. I have eibach dampers on the ed30 and Koni dampers(adjustable) on my previous rx-8. But i reckon the rx-8 had the better dampen characteristics especially going over speedbumps. Also, the Eibachs croak abit over speedbumps in winter for the first few miles. My rx-8 never did that. As a coincidence my eibach equipped astra way back then, croaked too over bumps.
If i did it again, i'd go fsd's or KW. Just my opinion though.
Kev