Which lowering set-up?
 

So which lowering springs offer the best ride comfort. I know there is a sacrifice, but are some springs stiffer than others. I know for the M5, the Eibach setup is a little more forgiving in terms of comfort than the H&R setup, similar drops considered of course. Is there a difference in terms of ride comfort between the companies that offer us a setup (Hamann, H&R, etc)?

I'm also consider to get a lowering set-up, H&R looks quite popular than others

Any opinions from those with Hamann, Eibach or H&R setups want to chime in?

Aside from knowing the actual spring rates this is a pretty subjective thing - It is probably pretty rare that one has driven two different systems let alone all 3.