Camber plates aren't noisy at all! You don't hear them when you're driving
Only moment they will remind you they are on your car will be when you will take a pothole turning your steering wheel, that's all. I'm very satisfied of them as I didn't want something noisy!
Before, I was on M-sport suspensions, then I put the Eibach Prokit springs and finally the XTA. You can follow the ride height on the pics, but I should mesure it now. As far as I know, I cannot put one finger front and rear.
Not hard at all to compare the ride quality : OEM is like sh*t, dampers plus sport spring are better and coilovers are the right choice if you want to track your car! Second solution for street driving and some other stuff will be enough if you only drive on the road.
Don't hesitate to ask me other questions