I've just put Eibach springs on standard dampers, and I'm happy to report that the handling and the ride are better, on my first attempt at fast driving on a nearby road I was able to enter each of a series of corners at 60 and exit at just over 70, compared to entering at 50 and exiting at 60, I'm sure I'll be able to go quicker one I'm more used to them.
The communication of grip level is vastly improved, before the car would understeer very violently and all at once, now I can feel the onset of very mild understeer and back off, preserving maximum speed without getting out of shape.
The ride is better too, because it doesn't bottom out over every dip and bump, the spring are stiff enough to allow the suspension to do their job, and it feels better for passengers because the car feels better planted on the road.