IIRC the HD's have always been said to be the equalivent to the OEM Sach/Boge in Bilisteins product lineup. Comforts being softer.

I changed mine to HD's at ~200k. Haven't felt they were as good as the OEM's for last 85K IMO. I'll use OEM next time if i own it long enough to need another set.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)