Spax springs

has anyone tried the spax lowering springs?
Seen them on demon tweeks and wondered if they’re as good as the h&r’s or eibach?
 
I had Spax on an old BMW and they were a poor fit with super hard spring rates. Eibach and H&R are trusted. Im swapping my H&Rs for Eibachs (came with shocks I bought) and they seem more progressive than H&Rs which seem more track focused and harder. The way they are wound is completely different.
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