I'm not seeing the advantage of B4 over Sachs OEM. Example - e60 5er alloy body for Sachs (as per Original), Steel body for B4... and about the same price (at least they were a couple of years ago). Very close pricing for the e46 Sachs vs B4. Naturally, YMMV. And agree - almost all new shocks are better than worn out old shocks. Let's throw Monroes into the mix - yecchhh. Has anyone been game enough to try Meyle shocks/struts? They're real cheap - half the price of Sachs OEM.