I put on B4's along with Eibach Pro lowered springs about 6 weeks ago. Probably only done 100 miles so far on them.
My impressions:
I haven't noticed any difference in ride quality, however, I feel that my old shocks were past their prime, so maybe I am used to a harsher ride?
One side of the car is around 5 mm lower than the other. We've had the car up on a ramp, taken measurements, checked everything out and cannot notice anything different between sides. It's not overly noticeable, but when you know, you know.......