Robin - when i was looking in to arbs i researched a few types and it came back that the eibachs seem to be pretty neutral - thats why i went for them, at the end of the day i dont think there is much of a differance between any of the aftermarket ARBs unless you are going for the thickest of the two h&r bars
so thats probably why VWR suggested you not to change as the eibachs are just as good.
Im with you though they are great for fast road and track, aswell as sharpening the car up no end !
I had a play about with the settings on them too, its good to get the car to behave how you want, it was set to medium on the rear which felt pretty good but i didnt like the fact you used opposite holes to get that adjustment ( it looked weird kind of like the arb was kinked ! ) so i then put it soft on the rear ! Which i thought made the rear sqirm a bit under braking!
My plan is to get them back on after winter and try hard on the rear to see what thats like !
There was deffo a reduction in wet grip though and it was compared back to back with oem as i dropped my car off standard and picked it up with the eibachs, like you said though its no grate shakes you just adjust your speed to suit, thats maybe why vwr dont use them, there cars are stiff enough with race coilies and would maybe have some grip issues in the wet??