With non-adjustable sets I've found I don't really care for anything with Blistein sourced dampers, i.e. H&R and KW, as the rebound settign is simply too stiff for DD use. For adjustable sets I like Koni and KW. I've owned two different sets of KW v2s and loved them both times. I really with Eibach and Koni made coils for the M3 but since they don't I'll probably go with Eibach springs and call it a day.
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