I have the B springs on my car, only on the rear for now. I had a broken rear spring, and the B springs raised the car vs the old broken shot stock springs.
I used the Energy Suspension urethane Isolators as well. The front springs are going on soon, had to take a detour to replace the transmission first
The car bottoms less and tracks better vs the old springs. I am very happy as I did not really want to drop the car too much, and the FMS springs were cheaper than stock replacments.