yes i have, i have a 3.0ise roadster and i installed the eibachs for a further 15mm drop over the standard 3.0 sports supension. im also running 19's, and all i can say is that its no worse than i had 18's with run flat tyres and the normal suspension.
before the lowering springs were installed i always drove carefully dodging pot holes and took any speed bumps at a careful speed, so it hasnt really bothered me. maybe if i did lots of miles in the z it would bother me more?
a few others have also fitted these, and i am sure they will be along soon with their findings.....